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