If you are a provider on SproutStep and want to connect your PayPal account, you must have a Business or a Premier account at PayPal. This is required in order to process credit card payments from non-PayPal users. If you don't have a business or a premier account, upgrading your existing account or creating a new PayPal Business or Premier account is quick and free of charge. There are no additional costs involved.
To upgrade to a PayPal business or Premier account, go to http://www.paypal.com/upgrade. If you are an individual (non business entity) and PayPal asks for a "business name" just enter your own name.