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