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