TH310

Flying FCO-EWR tomorrow. My boarding pass says "check in at terminal 5 and take the bus to terminal and then all UA flights depart from Terminal C." Since I already have my boarding pass and have carry on only, can I go directly to terminal C? (Planning on taking the train to FCO and then to Customs and Global Blue--supposed to get a a VAT refund--if that makes a difference.) Is there a lounge at C? My UA app has such a tiny map that it is hard to tell....

Thanks!