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