How to link profile and username via URL?

Question

WordPress

While working in WordPress'e Elementor encountered difficulties...
When you registered and entered the site, your ID should be linked to the profile.
There is a profile button in the “hamburger”, when you click on it, an error with code 404 is immediately issued. Even though, when I am, say, on the page http://example.com/youmessage/, the name is simply added at the end of the link http://example.com/youmessage/username. How to link the page of the user who is currently sitting on it when clicking the button to the profile?