There are two ways of booking a sitter:
If you are a new client
1) Contact the sitter via the contact button on their profile.
2) Once they have responded in positive, arrange for a meeting in person.
3) If the meeting in person was a success, click on "BOOK NOW" in the message thread.
If you are re-booking a sitter whose services you have used previously
Just surf to the sitter's profile and click the contact button. If you and the sitter have already agreed on the dates, send them first a message, with the right dates and service, about it and the 'book now' button will appear on the thread. Click on it to process the payment.
You can reach your sitter's profile via the list on your dashboard, in your favourites, or by clicking on their profile picture in a previous message thread.