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