In the rich text editor:
@CryptidCreature
In a comment:
[CryptidCreature](https://chowlings.com/user/CryptidCreature)
For Names and Avatars:
In the rich text editor:
%CryptidCreature
In a comment:
[![CryptidCreature's Avatar](https://chowlings.com/images/avatars/1935.png?v=1673982090)](https://chowlings.com/user/CryptidCreature) [CryptidCreature](https://chowlings.com/user/CryptidCreature)