In order to create a new service in SSO and attach to a webapp you have to:
Click on "Aggiungi un nuovo servizio"
Fill the creation form:
Name, usually based on the repository name
Photo, it's mandatory, can use Eagleprojects logo as default. Download here eagleprojects_logo.jpg
Link Redirect, webapp FE url (if BE and FE are same use BE url)
Api URL, webapp BE url