I dont understan how set this meno cant give me possibility of add buff and song skill ... any help?

it was designed for old L2 before 4th class, some songs may be not added, if you got one song then just setup it as buff

I want to use an iss 4 buff a party .... what I do?

I set them as self buffs... you may also set them as party buffs but sell bufs are better

ok now try search same plugin on list insted on the dance song menu can't select any skill or buff... dnt have botom to add ...