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