when I use the permission essentials.kit.use.buy you can buy stuff from the sign [buy] but when I do essentials.kit.use.kit all it says is permission essentials.kits.pvp needed to use this kit, how do i fix this

Add the permission ¯_(ツ)_/¯

essentials.kit.use.kit all isn't a thing... Neither is essentials.kit.use.buy.

The [BUY] signs use essentials.signs.use.buy
The [KIT] signs use essentials.signs.use.kit

To give someone access to all kits, it's essentials.kits.* or essentials.kits.[kitname] to give someone access to a particular kit only.

@Xtreaper101 If this is still an issue after following @Fordy436's advice, could you explain the issue more clearly?

Closing due to lack of response. If this is still a problem, feel free to respond and we'll reopen the issue.