Hi johnster0777,
You can edit your listings even if you don't upload them individually. If you click on For sale under My Ads in My Addoway you will see the bulk edit tool over your listings.
I haven't really tried Pinterest or LinkedIn , but I think this is the thread Frank was referring to - Link hidden: Login to view
How to advertise cheaply or for free is often discussed here on our forum and we have all shared vital tips in achieving this. You can find some of the tips in these threads -
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Hope this helps somehow :)