EDITED TO ADD:
after posting this i (of course) figured it out myself. BUT i decided i better post how so the next person wondering will know! and i left my original inquiry in case it helps explain things.
to edit the length of each clip, look at your movie on the bottom of the screen where it is shown in the timeline, (storyboard without music, and timeline with music clips.) click on the individual clip you want to lengthen or shorten and then hold your curser over the line on the right of the clip, the one that separates it from the next clip. you should get a red "left-right" arrow. when you hover and get this arrow, a hove messgae says "Click and drap to trim the clip." as you do this, another hove message appears and shows you the length of the clip, left dragging makes the clip shorter, and right dragging makes it longer! hope this helps someone else!
morgan, sarah or anyone else knowledgeable about WMM:
i am just getting started with this, i'm only using picture files, and i dont need my pics to show for more than 2 seconds. my problem is that so far my video is over 12 minutes long, because of the length of each slide (each slide is on the screen for like 5-6 seconds, and i've got over 160 pics, hence the long length of the entire video, AND i'm not done adding pics! yikes!)
does anyone know how to make each slide shorter? i will keep playing with it until someone answers, but i havent been able to figure it out yet so in the meantime i thought i'd ask