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