I have yet to figure out the nuances of organizing things on the site yet, but I did figure out how to get a pic posted! That's the important thing!!!
Once you have selected the pic you want to post, click on "share"...it's the arrow icon.
You'll get a pop up window with "Share...Embed...Email...BBCode"
Click on "BBCode"...code will be highlighted...."copy" the code.
Come back here, click the image icon above and "paste" the code in "source"
Starting at the far right end...highlight and delete everything from the end, back through and including [/img].
Do the same thing at the front of the code, starting and including "[img]"
The "BBCode" is the important part. You can leave the whole code in "source" and the pic will show up after you post, but will have some code showing in the post, just under the pic. Deleting that extra stuff will eliminate that extra code showing up...AND the pic will show up while you are still working on you post.
Hope this helps!!!
I will edit this later, with some pics. For some reason, when using the app (I upload directly from my phone/cam to Flickr), it takes a while before my most recent pics will show up, for me to upload.