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