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