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