Here is what I learned (mostly from Brian E) about posting images here:
Get a postimage account. I don’t think there is an Apple app. Just bookmark or save the mobile web page to your iPhone’s screen and it will work as handily as an app.
Go there and (pull down the menu at the top right) and “upload “ square (or whatever shaped) photos from your photo library on your phone.
Copy the URL of the photo by using the “direct” link option (second one down) using the little icon to the right. (Don’t copy the url in the box there it won’t copy to Agon).
go to Agon thread and refresh the page
Paste url into the photo box in the new menu above the text box. The photo box has an icon of mountains I think (not the regular text box that doesn’t work)
Click center
Go back up a little and type 350 x 350. With the lock on It Will do the second number for you (or it will be close to 350 anyway)
click done or whatever
check the preview
post your photo
its pretty lame and way to involved, best attempted in a state of grace…