Can you tell me which relay you're speaking of? Thank you.
Hi Bill and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially and almost always, the relay manufacturer uses a dab of sealant/adhesive of sorts to reduce if not prevent dirt/dust entering the relay contact compartment.
It would require tweezers or small/jeweler's screwdriver to pry through the small openings to lever off the small tabs.
The preferred method is to de-solder and work on the relay out-of-circuit.
Hopefully, the image HERE may shed insight.