I found the hosting site a nightmare to use when I first posted pics upon on here, dont know if you are doing this but here are the steps I follow
1-Select host image
2-upload desired image
3-click "host it"
4-copy url that says "image" ie the middle option
5-Copy and paste url into post!
add any txt then preview you should then see your post with images!
Apologies if you are already doing this but i dont want to sound condescending just I dont know what steps you have tried so far!!!