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