96 Honda Magna how do I put baffles back?

They had been removed when I bought the bike. I like the bike but its way to loud.
I would like it as quiet as possible without causing other problems

It does not appear they can be rebuilt. You'll have to replace the tips.

Notice there are no replacement baffles.

Search out a stock exhaust on eBay or where ever.
And thank you for trying to make it quiet.

There are aftermarket exhausts that aren't too loud and with good performance, suggest you search out on the net for a Honda Magna forum or two.