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