If the tranny is slipping then you might have some real problems. If it is due to low fluid then its a relatively an easy fix but I am not sure if you are going to be that lucky. In the event that it is just low fluid, fluid is simply added at the tranny dip stick. Make sure that when you pick up automatic fluid that it specifically says for Honda transmissions. If you put regular tranny fluid then you could really screw things up. Come to think of it, that may be where the problem originated since you just picked it up. Good luck anyhow.