To add review, do the following:
Click Add link (under Change Review tab)
Add Review Section opens up
Enter the Review
Add Attachments (if any) using Attach a file link
Schedule date for next review (see: scheduling next review)
Save it
Editing Review
Click Edit link (under Change Review tab)
Edit the review
Reschedule date for the next schedule (if required)
Add Attachments (if any) using Attach a file link
Save it
While adding review, do the following in order to schedule the next review:
Click Calendar Icon
besides Next Review Schedule option (available below review section)
Select date for the next schedule
Specify/Schedule time for the review
Save it