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