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