In the rich text editor:
@Subw00f3r
In a comment:
[Subw00f3r](https://chowlings.com/user/Subw00f3r)
For Names and Avatars:
In the rich text editor:
%Subw00f3r
In a comment:
[![Subw00f3r's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/Subw00f3r) [Subw00f3r](https://chowlings.com/user/Subw00f3r)