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