Yes, patients can change an upcoming payment's due date depending on their repayment frequency. 

To change an upcoming payment's due date, the patient would follow these steps:

1) Select 'Repayments' from the homepage of their dashboard:

2) Within the 'Repayments' table, select  'Change Repayment Date' from the Action Column.

3) From there, the patient would select from one of the eligible repayment dates in the calendar and click 'Change Repayment Date' to change the date of their next repayment.