Step 1: Click on "Vendors" located on the left side of the screen.
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Step 2: Either find the vendor that you want to pay and click on "Pay a Vendor" in the left corner of the vendor box  OR  you can click the blue "$ Pay a Vendor" tab in the upper right corner.
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Step 3: Select the vendor, add payment details, confirm return address and then click the blue "Submit Payment" tab.