Help in add proxy to follow liker

Hello,

I purchased follow liker but I have problem in adding proxy to accounts , Every time I add proxy and press start i get this error message

Check that your proxy is working and also check that your Twitter username and password are correct

I'm sure username and pass working fine and been tested , when I work without proxy it works fine .

I'm using proxy that requires user authentication, can any one help me how to add my proxy

ip: port:username: pass

is that right?