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