In the rich text editor:
@Panextl
In a comment:
[Panextl](https://chowlings.com/user/Panextl)
For Names and Avatars:
In the rich text editor:
%Panextl
In a comment:
[![Panextl's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/Panextl) [Panextl](https://chowlings.com/user/Panextl)