you should be able to download Skype in the US app catalog.
after you install it, I think the easiest way to Skype IM/call is through Just Type.
(1) Sign in via the Messaging app
(2) minimize the Messaging app
(3) Use Just Type to locate the person you want to call/IM
(4) then select their Skype account
(5) select whether you want to Chat or Call them.