Everyone does this different.. I use Windows Paint to open them and then under image I go to resize/skew and reduce the picture size until it is down to at least 90 KB. Then I upload it under my personal profile on here. After that I post what I want and then go back to my personal profile on here and copy the pic. Go back and edit my post in which I then paste the pic I just copied.

I also copy the pic and store some place else before using Windows Paint so that I will be able to keep it unchanged..

I hope this helps you out..

Others will most likely chime in the way they do it as well.