I believe they twist and pull. You should be able to look at the parts list for the style of bulb required.
Saw a friend spend many hours trying to replace a turn signal housing because of similar problems. I wound up spraying with WD40 and letting it sit for an hour and removed the now broken lamp with a pair of needle nose pliers.
He wasn't able to get a factory replacement so he fixed up his old one best he could but with the internal corrosion of the bulb housing I don't think it will last all that long. I hope you have better luck.
Enjoy Life! It's later than you think. Life changes in a second. There isn't enough time for cheap booze and cheap cigars.