I like to use subtitles when watching movies . Does anyone know how to access English subtitles when watching movies on the ipad?. I can go to the subtitles option but all it offers me is Portuguese ones.

Obviously it would depend what app you are using to watch your movies.

I download from iTunes and watch them in the movies icon

They may not be supplied with English subtitles. If you search online it seems to be quite a common question.