The booking screen displays a line "Repeat booking" :

 

Choosing this option leads to a menu where you now specify the type of repetition:

 

And then, in the following screen, you set up the "duration" of the booking to be repeated, either by setting a "end date" or a number of repeated time. 

 

Save by clicking on the "Done" button.

Note that the repeated bookings are now considered as a "group of bookings" and hence when modifying any of them, you will be asked if your change relates to "only this booking" or "all of them".