How does one post photos in portrait orientation?

Adding Photo Album, I have tried cutting the height down to 480 pixels and, when that did not work, unticking this in Preferences. I still get the top of the photo cut off and an image in landscape orientation.
Please advise! Thanks in advance!

I’ve just found the answer myself (!!) after searching around for ages and then posting this question. I needed to look at the Inspector, “nut” tab (as in nuts & bolts) and reverse the size settings! OK, now to get on with the job!