Are you on a windows computer? quick and easy>
Pressing the little windows button on your keyboard and the letter R will open the run menu, type mspaint (or find it in your program list under start menu, under Accessories)
you can either open the image in paint by clicking in the top left hand drop down, or drag and drop the image into the paint window
Just in from the left hand side there is a button called resize, click it and then a small window opens up, with 2 blanks for how much of a percentage you want to resize
I normally use like a 30 and it will automatically put it in the other blank as you type it. close the small window, then go file, save as, choose a name for the picture and save it where ever you like. Its now much smaller and easier to handle (30% of its original size) I save it under a new name, so that I still have the full size original.
Once you do it a couple times its really quick and easy. Mac computer? no idea. :lol: