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