Sigil: City of Doors

How do i send a tell to another player?

You ca also access a player chat list from the in game menu and open tells by clicking on the name in that list. It auto-fills the code Slimy doom listed.

my thanks to the both of you

if you have the client extension tool i believe you gain the /r and /re commands which "replies" to the last person you had received a tell from.