Hi,
Basically you cant edit a new post; that you make, you can only edit your replies to other peoples posts. I have taken this up with Justin in the past but nothing changed.
As for loading pictures... easy peasy...
First you need to upload the pictures to photobucket or some such file storage site. If you use photobucket , once the picture is uploaded you will find a box beneath it it with four options for copying the address of the picture. One of the options is called 'Direct Link'. right click and copy this address.
Then, on the top row of the EOS window where you write your post, you will see, 3rd icon from the right a yellow square with what looks like two mountain peaks. Click on this icon an a new small pop-up window appears; paste the url of the photobucket reference you took earlier into the url field of the pop-up window, ignore everything else in the pop-up window, just click on 'OK'. The pop-up disappears and the picture you sent to photobucket should now appear in your post window.
PIcture size in kbs doesnt matter really because its not being hosted on EOS servers. Picture width however should be kept to less than 750pixels to avoid stretching the window.
Hope this helps.
fb