To do this video i had to open up IMovie and then import a video, to put different parts into the programme to edit i had to left click and drag over the pieces i wanted to use and then drag them up into the boxes where you put your clips. After that i had to decide where abouts i wanted to put them and put them in order at the beginning i had to put a title and then at the end i had to put credits. to put these i had to click the text logo near where the preview screen was and then pick a title or credit which i wanted to use then drag it into the box and then type in what i wanted. once i did that i had to click the top bar 'share' then export the movie out to turn it into a .Mp4 file.