To set up your "Available Times", go to the "Calendar" page from the "Menu Bar". 

 then press the "Set Availability" and submit your available timeframe. Press "Set Date" to select period of days between two dates, and use the "Set Start Time" and "Set End Time" to set the available timeframe for every day in those specified dates. 

When you're done adding "Available Times", press the "Save Availability" button at the bottom right of the page to save and go back to the "Calendar" page. You should see the green "Available Tiles" on the "Calendar" that indicates the "Available Times" you've set.