When you try to post, does it say that your picture is too large?
If so, I found the following to get them on here.
I pull the picture up on my computer, right click on it. Then select the edit button. This pulls up (Paint - I do not know if you have this program) I go to the top and click on image then select strecth/skew and reduce the size down to like 50% save the photo as another name and then post that on here.
Hope this helps you. IF not, I don't think I can help you as I don't do I.T.

John