You can register as a city bike user at the address kaupunkipyorat.ouka.fi. When you register you will receive a personal cyclist ID and PIN code that you need to pick up a bike. Instead of a cyclist ID, you can also use your Waltti Travel Card and PIN for authentication. 

You can purchase a period of use for a day, week or for the whole season. The day use costs 5 euros, a week 10 euros and a season 20 euros. The first half hour of each bike ride is always free, regardless of the number of trips per day. If you exceed the time, you will be charged a small extra fee 1€ for every additional 30 minutes. The maximum time of use is five hours at a time.

You can pick up and drop off a bike at any station. The city bikes are meant mainly for short-term use and the included bike ride without additional fees is limited to 30 minutes to ensure that there are city bikes available.