First choose the treatment you need, then choose the therapist, after that you can browse free times. You can book time one hour before so you can look in the morning if there are any free times for the day. After booking you will receive a confirmation email and by that you can make changes or cancel time on yourself up to 24 hours in advance.
Notice, if you have some problems with booking system below, you can try direct link to booking here: https://vello.fi/fysioniska/
There you can also change language of booking app. Click in the upper left corner ”Valinnat” and there change ”Suomi” to ”English”.