Your nonprofit will need a GuideStar Nonprofit Profile before becoming a Give Lively Nonprofit Member.
From GuideStar: "A GuideStar Nonprofit Profile is a web page displaying information on a single nonprofit organization. The data GuideStar has on nonprofits comes from the IRS Business Master File, IRS Forms 990/990EZ/990PF and from the nonprofits themselves. GuideStar Nonprofit Profiles are created using basic IRS information."
Claiming your profile is easy. Follow the directions provided by GuideStar here to complete the process.