Once the administrator approved, your IdP metadata will be included in the Federation metadataMetadata.
Register Service Provider (SP) Service
The steps to register a Service Provider (SP) service is pretty much similar like to an IdP, hence you could follow the steps for an IdP to register an SP service. The main difference is instead of clicking "Register->Identity Provider" menu, you shall click the "Register->Service Provider" menu to register an SP service.
Updating Metadata Information