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