Help! How do I add photos to a shared stream

I set up a shared photostream. I added some photos to it.



But now I want to add more, but for the life of me, I can't figure out how to do it.



Here's what I've tried:



Go to album, select photos, tap add to, albums show up, but no shared stream.



I vaguely recall that the process was slightly obscure.



I know google is my friend, but it only coughs up instructions for setting up a stream so others can share, but no actual instructions for adding photos.



Please help, I'm losing my mind.

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