In the rich text editor:
@Solobod0r
In a comment:
[Solobod0r](https://chowlings.com/user/Solobod0r)
For Names and Avatars:
In the rich text editor:
%Solobod0r
In a comment:
[](https://chowlings.com/user/Solobod0r) [Solobod0r](https://chowlings.com/user/Solobod0r)