In a most places you have two (or more) options for printing:
You can either hit the print button, shown here
or you can go old school and Ctrl-P. The results are a little different and you might find one is more to your liking than the other, but they both print.
Even on pages that don’t have the print button, you can still Ctrl-P to print what’s on the page. Like the preview list of emails in your inbox for example.