Verkitwme sorr you are having so much trouble and know how frustrating it must be for you. Without knowing what format you are trying to up load or which way you are trying to add the picture we have little to go one in help.
Are you using the "Upload a File" next to the post reply then just make sure you are following the promos and that your file extension is one of the ones listed basically how the file ends like jpeg, gif and so on.
If you are using the URL photo link then out of a hunch maybe URL link site may have a block on certain types of sites.
Anyway that's the best I can do from here with what info is provided thus far. Have you ever posted a picture here previously?