You can either reduce the size of the file ( which i don't think will work to well as it might be hard to read for every one) or you can use a hosting site. This will work well and will let you show the image/article at it full size. As it is an external link there will not be any conflicked with this site and the size you can post.
Here is one such site.
http://tinypic.com/It is pretty strait forward to use.
First, once you have opened the web site up above.
Click on " Browes " select your image from your files.
Then click on " UPLOAD NOW"
Then type in the security code and click on " UPLOAD NOW " again
Once the image is ready for transfer to here, copy from where it says " Direct Link for Layouts "
And place it on your post here, paste what you have just copied from the TINYPIC website and put it in {url]
HERE [/url]. You will get these symbols by hitting the GLOBE/WORLD image above when you put your cursor it will say " Insert Hyperlink "
Good luck and hope i explained it ok for you ?
Migky