In the rich text editor:
@L4Wreth
In a comment:
[L4Wreth](https://chowlings.com/user/L4Wreth)
For Names and Avatars:
In the rich text editor:
%L4Wreth
In a comment:
[](https://chowlings.com/user/L4Wreth) [L4Wreth](https://chowlings.com/user/L4Wreth)