To find your user id all you need to do is look under the neighbor bar. This is what you need to either copy and paste or write down for when you write to support.  Have a look at the screenshot below to see where the USER ID is located 

Support can't look at your account without this. It is very important when you write a ticket to support that you give as much detail as possible when you write. If you don't give as much information as you can then it will take longer to get the help you need as we will have to email you back and ask you more questions, then wait for your reply and then we can check your account if you then gave us enough information. 

So the more information you can give when you first write to support than the faster you will get resolution 

If you are contacting support about items not counting towards a quest: We need to know what quest exactly are you working on, What step of the quest, what building you are clicking on to get the item needed for the quest, what item exactly you are supposed to get from the building. 

If you are having loading issues:

Please go here and do ALL of these steps first before writing a ticket 

1) Make sure you have updated your computer system.
2) Make sure you have updated your browser such as chrome, etc.
3) Have you tried on another browser? Or are you using the Facebook Game Room, perhaps?

If you use Google Chrome :
If it’s not working anymore please try on the Facebook Game Room or Microsoft Edge/Mozilla, but the Game Room is the first choice.

If you use Puffin:

Unfortunately, the Facebook version of Supercity is not meant to run on mobile devices, this is why we have released the mobile version of Supercity.

Running the game's PC version on your mobile device (tablet or phone) using an emulator such as Puffin browser or any other can slow it and cause other technical problems.

Unfortunately, our customer support service won't be able to help you resolve them in that case.

Using emulators isn't considered cheating, but we recommend using your computer for a better playing experience :)
If you use Safari: and it works bad, try on Google Chrome or Firefox (many users say Firefox will work for them)

If you are using a Chromebook style laptop:

Unfortunately Chromebook has updated their OS system and it is no longer compatible with some Facebook games. As of August 2019 Our game is one of them sadly

If you recently updated your OS that is why you are just now having this issue.

We are suggesting our players to contact Chromebook and let them know of your dissatisfaction with their choice to make this update to their OS system.

I have googled and found this site as it may be helpful for you. I can see on the right side of the screen under device help there are specific links to click on for a particular Chromebook so you can choose one of those.

Chromebook Help Center

There was a post made about this on our fan page back on August 29th 2019:

Fan page post about Chromebooks
Does the device you are using have the correct requirements?:

Minimum requirements: 
- 2 GHz processor,
- 4 GB RAM,
- GPU with Stage 3D support.

Minimum Requirements for HTML5:
Processor: 2.1 GHz
RAM: 4Gb
Videocard with support webgl 1 (can be checked here
OS: Windows 7/10
Browser: Google Chrome (Latest version)

Recommended requirements (perfect game performance guaranteed):
- 3 GHz processor,
- 16 GB RAM,
- GPU with Stage 3D support.

 In case nothing works, try the incognito mode of the browser, for some, this actually helps

 Are you missing a decor item or a building? Please try using the new Search tool we have added to the neighbor bar first before writing to support. 

It is very simple to use:
1) Click on the search tool in your game
2) Type in the name of the item or building you are looking for
3) Click on the show button and it will show you where the item (s) are in your city and in your storage. 

You must spell the items EXACTLY how it is spelled in the game for it to work.

Example Photo below: