To enter a pledge payment, you can add a new gift from the Constituents Grid in the CRM Module or the Gifts Grid in the Fundraising Module by selecting the +New menu and choosing Gift, or from the constituent's record under their Gift tab by clicking on Add then Gift. 

From the New Gift Screen, select Pledge Payment as the gift Type. Once Pledge Payment is selected, the screen will update and show the pledges in the drop down menu under Pledges. Be sure to select the correct pledge to pay, then enter the Date, Payment Amount, and other information as needed. Note that the revenue categories, For-Fund-Event-Appeal-Fundraising Goal Category will auto-populate with what was assigned for the original pledge.

 When finished entering the information, click on the green Save or Save and Acknowledge buttons at the top or bottom of the page to complete the transaction.