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