I think just by walking in. This is the interaction with Chet and Flo. I have done this, and went back to Snow Mountain, however, I still can't access the mission "Bread's Weapons". Idk what I'm missing yet. Can't seem to find him outside tavern
Edit: Nvm, it's working now. I forgot there's a note where I have to meet Katos and Shroomberus again to make it work.