pAint484

Hi everyone... I'm new to all this so I'm just trying to make a collage of DVD movie covers and music. So i have my black background and I'm dropping in jpeg files... move them where i want but when I drop a new one in, i can't for the life of me figure out how to reselect the previous jpegs to readjust them. WTF? haha I know.. really easy question.. I tried search.. didn't really find anything... or maybe i just wasn't sure what to search for.. TIA! -Val