try this a few times
open image in PS
look across the top of window:
choose > Image > then choose > Resize > then choose > Image Size
a pop-up window comes up
there you will see:
"Pixel Dimensions"
Width:
Height:
just to the right - you will see 2 drop down arrows and a " ] "
choose > Pixels
look at your picture > decide if it is a "landscape" or "portrait" picture
if it is a landscape picture - then your longest dimension will be the "Width" box under "Pixel Dimensions" mentioned above
change whatever number that is in the "Width" box, to whatever new dimension you need it to be
hope that helps
