An organization that wants to provide identities - i.e operate an Identity Provider (IdP) - within the SWAMID federation must become a member of SWAMID.
When the membership is approved you are free to deploy identity providers and service providers in SWAMID. Normally a single identity provider per technology profile is required but there are exceptions to that rule. Contact SWAMID Operations for more information.
Additionally your organization may need to fulfill additional identity assurance requirements by conforming to a SWAMID Identity Assurance Profile.