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