In the rich text editor:
@nin_writes
In a comment:
[nin_writes](https://chowlings.com/user/nin_writes)
For Names and Avatars:
In the rich text editor:
%nin_writes
In a comment:
[![nin_writes's Avatar](https://chowlings.com/images/avatars/364.png?v=1644063283)](https://chowlings.com/user/nin_writes) [nin_writes](https://chowlings.com/user/nin_writes)