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