1. Navigate to Contacts > Individuals 
2. Search for the donor's name, hover over Manage and click Manage Contact
3. Click the Financial tab and click the Transactions sub-tab
4. Click New Gift 
5. Enter in Amount Received (as the first payment amount)
6. On the Gift Type drop-down, select Recurring Gift 
** This will provide Recurring Gift detail information at the bottom of the page to specify the Installment Amount, Frequency and Start Date.  
7. Complete the payment information and click Save

Note: If you do not want to charge the first payment at the time you create the schedule, leave the Amount Received field under "Recurring Gift Detail" at $0.  If you enter an amount in that section, the first payment will be charged upon clicking Save.