The cats iron joint shown on the attached picture leaks when the bathtub is in use. Is there an easy way to fix it or do I need professional help? Any info would be appreciated!

If the lead ring is intact all the way around the joint all that needs to be done is to recaulk the joint with caulking irons. If the leaq is missing from the bottom, (I can't see to tell) then the joint should be redone. Regards, Tom