Your appointment calendar lives inside the Clients screen, and before using it you have to tell it when you work.

• Your usual hours: which days of the week you work and between which times.
• Blocked dates: holidays, public holidays or a day you close.
• One-off blocks: a particular hour you want to keep for something else, for instance if someone phoned you and you gave them that time.

A one-off block takes the slot exactly as a real appointment does, so it cannot be given away twice (see «Why you cannot give away the same hour twice»).

The most common mistake when starting out is not marking the days you close: the calendar will keep offering those hours as free when you go to book someone in.