"Gh" represents an archaic pronunciation. It used to be pronounced like German "ch", but that sound doesn't exist in English anymore (outside of Scotland anyway). Most of the time "gh" is now silent, but sometimes it's pronounced "f", as in "laugh".

Thank you very much guy. I was saying "gh" like in "frog"

For the word 'laugh' the 'gh' is pronounced 'f' as in 'laf'