You had better fortune than I. I tried out of curiosity, and got nowhere: couldn't even see ITA in the dropdown menu.. There again, SV can be difficult: last week the website wasn't accepting Delta numbers. The workaround is "my booking" on Tarom's website to add frequent flyer numbers Saudia doesn't want to know about.

The original way to blag it with a Volare card was to convince SV check-in agents to add the numbers as Alitalia, so it's good to know you managed to add your credentials yourself.