you need to make an account at WES...
then get your transcripts from college and send one transcript to WEs in official college envelop and it should be sealed.
Also , my friend was asked by WES to send one copy of all his marksheets xeroxed and attested by the university...remember , by university NOT by the student section of college.
So ,send that too along with the transcripts.
Dont forget to select "course by course" evaluation at WES to get your correct GPA...approx 200$ i think.
Lastly , remember to check if the university you are applying needs WES GPA or not...many colleges simply ask for transcripts and find out GPA themselves only. So , confirm beforehand.
Good luck !