Head over to your Calendar tab and select Availability.
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Here, you can set the specific hours that you are available for any specific day by selecting that day.

Or you can add the hours for every day of the week by selecting the drop-down menu at the top of each day. For example, all hours added on Wednesday will carry over to every Wednesday that month indefinitely.
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The settings you add at the top of each day get applied indefinitely to all months and years.

You can preview how your availability will appear by clicking the Eye icon at the top right.

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That's all there is to it; you've now set up your availability settings.