

To change the duration of an image in the movie there are many ways .The best way, if you wish to change all/ many of the images to the same duration. Highlight the image you wish to change, right click. Now select Duration, from here a box will appear where you can change the length of all the images. Once you have the desired time click on OK and this will then change the duration of each image that was highlighted.
If you need to rotate your footage to a portrait angle then you will first need to merge all your images into one clip. To do so you need to highlight all your images on the timeline, as done so before, and then select Sequence, Nest Item(s).
This will then bring up this window in which you need to just click 'OK'. This will then merge all the clips into one.