In the rich text editor:
@Mivf1
In a comment:
[Mivf1](https://chowlings.com/user/Mivf1)
For Names and Avatars:
In the rich text editor:
%Mivf1
In a comment:
[![Mivf1's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/Mivf1) [Mivf1](https://chowlings.com/user/Mivf1)