The User ID is publicly visible in multiple places in your forum. In particular it's already visible in the URL of the member profile and any place you hover over a username.
Example:
https://vborg.vbsupport.ru/member.php?u=480258
There's your userid, right there in the URL of your profile.
If you click on your username in your post you can also see your userid in every one of the drop down options, because it's a parameter of nearly anything that involves you. Your user ID is neither secret, nor hard to obtain.
What exactly are you trying to accomplish that you don't already have?