Step 3:
This will bring up a window telling all sorts of wonderful things about your picture, including how large it is in kb (short for kilobytes).
As you can see, this photo is a wee bit too big, so it'll have to be reduced a bit in size using one of many available programs (e.g. Adobe Photoshop, etc.). For help on this task, read Dude's upcoming self-help book "How to Shrink Images for Dummies".