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