On Playstation:
Alternate L2 + R2 to get her pedaling and then you just need to use the left stick.
R1 or O to stop and dismount.
L1 for the bell.
If you get separated from the bike further than you want to walk to, just hit options and choose RETRIEVE BIKE.
Website where I post Game Guides for the games I play! The site is pretty new, so expect more guides to come.