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