In the rich text editor:
@Prince-charming01
In a comment:
[Prince-charming01](https://chowlings.com/user/Prince-charming01)
For Names and Avatars:
In the rich text editor:
%Prince-charming01
In a comment:
[![Prince-charming01's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/Prince-charming01) [Prince-charming01](https://chowlings.com/user/Prince-charming01)