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