With my Tech Support hat on,
“I can’t [do something]” is unhelpful in isolation. Possible causes for “I can’t post photos” could include: my mouse is broken; I don’t have a camera; there’s a powercut; my hands have fallen off; the house is on fire.
If you can’t do something then what is helpful is a description of symptoms. WHY can’t you post photos? Does the Insert Picture button do nothing, does the upload fail with an error (and if so then what does the error message say), something else?
One thing I found with photos pre-move is reducing the physical size helped, I could post an 800×600 resized image but not the original straight-out-of-the-phone version of the same thing regardless of file size limitations. Someone else mentioned that if the filename has more than one dot in it then it chokes, so foo.bar.jpg fails but foo-bar.jpg works.