You can just post a video on Youtube and then post the link to it here.
Where is the rattle coming from?
Does it only happen when you're moving or also sitting idling?
If it's in the back or middle It could be the exhaust barely rubbing on something. You really need it on a lift to inspect it underneath. I would take it to a local garage and pay them a little something to let you look it over while it's up in the air. You should shake the exhaust when it's up on the lift. If it rattles even when sitting in neutral then you can ask the mechanic to lift it with it running.
Where is the rattle coming from?
Does it only happen when you're moving or also sitting idling?
If it's in the back or middle It could be the exhaust barely rubbing on something. You really need it on a lift to inspect it underneath. I would take it to a local garage and pay them a little something to let you look it over while it's up in the air. You should shake the exhaust when it's up on the lift. If it rattles even when sitting in neutral then you can ask the mechanic to lift it with it running.