In the rich text editor:
@AkiTheRandomArtist
In a comment:
[AkiTheRandomArtist](https://chowlings.com/user/AkiTheRandomArtist)
For Names and Avatars:
In the rich text editor:
%AkiTheRandomArtist
In a comment:
[![AkiTheRandomArtist's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/AkiTheRandomArtist) [AkiTheRandomArtist](https://chowlings.com/user/AkiTheRandomArtist)