You should have a page called Purchases.
You can print that out, or you could open each transaction and print out the information you need.
It may be simpler to buy a little notebook and when you buy something online, write down the date , what it is, what was paid and when, and when to expect it. You can also add notes easily in a notebook, which I find harder to do on the computer-- unless I use a spreadsheet .And Excel hates me.