These programs require no effort on your part once you sign up. You enroll your organization, then ask your supporters to use the program. Once THEY enroll, they don’t have to do anything else. Your group must be a 501(c) 3 to use these programs except for igive.com.
Before you start, get the following together so you won't be running around like a nutcase. In fact, while you're at it, print off a couple of extra copies of your 501(c)3 Letter of Determination and stick that and copies of the other stuff in a fundraising folder.