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