Extra Slot Silver (W.I.P) (the return)

extra slotExtra Slot Works In Progress for Sonic 3 A.I.R. (S3AIR) Ads keep us on. Without them, we wouldn't exist. We don't have paywalls or sell mods - we never will.I want to put on wehts but i don’t know how to open the extra slot menu, i swear to jesus i tried everything i have no idea how to open it can someone please help? This topic