trying to override onItemRightClick so i look in the list of overridable functions in Item class and it doesnt exist?

Forge now ships the mdk with the official mojang mappings over the previously used mcp mappings. As such, fields/methods/params will be different between the two mappings. For example, Item#onItemRightClick has become Item#use. If you would like to use the old mappings, you can look on Forgecord in the 1.16 modder support channel's pins and find the current version of the mcp mappings available.

thanks so much

Hmmm i'm not able to access onItemUse as an override for my item class

create your own Thread and post details (like forge version)