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