How does Bilbo Baggins still make use of his magic ring in the end of The Hobbit?

He uses the ring many times in The Hobbit. He uses it to escape from Gollum and exit the mountain, he uses it when spying on the giant Spiders in Mirkwood, he uses it when the Dwarves are captured by the wood elves, and he uses it when in Smaug's lair.