Posting images directly to the site from your computer is the recommended method as unlike Photobucket or online sites the images will remain as accounts change etc.
To so is a very straight forward process.
1.) At the bottom of your post click on + Attachments and other options
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2.) This will show a number of options. Click on the Choose File button
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3.) This will open a dialog box asking you for the location of the image to upload from your local computer. You can upload up to 6 images per post - with all of them being no more than 7 mb in total. (To upload totals larger than than hit the preview button, and then attach additional files.)
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The site has no disk space limit so this is not an issue. Again all are encouraged to upload photos but, it is a matter of personal taste.