Solid Commerce integrates with all ship methods made available by UPS through the Straight SHIP API.
The only step necessary for you to make use of the UPS SurePost service is to be approved for it directly by UPS. Once you are approved, you can start printing labels through Solid Commerce/Solidship without any additional setup work.
NOTE: You will need to have established a connection with your UPS account in the Shipping Carrier setup section.
To learn more about UPS SurePost, please visit the following link: http://www.ups.com/worldshiphelp/WS14/ENU/AppHelp/SHIPMENT/About_UPS_SurePost.htm