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