Wordpress extension fix

Hi there, I need minor fixes in the following booking extension: [login to view URL] 1- I need some modification in time field. At the moment, we can add dates and times individually, you can check here: [login to view URL] Logins: admin/pass Now what I want is to change the way allotting times and dates. I want it to be like I can select an available date, then specify the range for that date for example 11:00 to 15:00, and then specify a duration value for example "30", so all the time slots of 30 minutes between 11:00 to 15:00 will appear with checkboxes, so which ever check box ill select, those slots will appear in front end time field. 2- The calender in front end is only appearing in windows/desktop, its not showing in other devices such as Mac, mobiles, etc please fix that. Thank you!