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