The Service Catlogue preferences control which service catalogue instance is searched for services in the Service Catalogue perspective. These preferences can be changed by adding a new service catalogue:
Base URL of Service Catalogue instance to connect to controls which service catalogue you are searching for services. Some institutions and groups will host their own instance of service catalogue. By default, Taverna Enterprise will try to connect to BioCatalogue at https://www.biocatalogue.org/. Taverna Biodiversity will, by default, try to connect to BiodiversityCatalogue at https://www.biodiversitycatalogue.org.
Note that both the BioCatalogue's and BiodiversityCatalogue's URLs start with https:// instead of http://.