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