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