Note: Easiest setup would be to print your USPS labels via Rollo Ship Manager. You will receive commercial pricing and labels in 4x6 format ready to print to Rollo.
After installing Rollo's Chrome extension, and logging in, visit USPS.com and click on Mail & Ship and choose Click-N-Ship
Proceed as usual to purchase your label. At the end, please click on "Rollo Labels" button.
Note: If you do not see the "Rollo Labels" buttons ensure your extension is installed and then refresh the page.