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