It could be that the ‘SAVE’ button is not appearing on your screen and you’ll want to zoom out. If you are zoomed in at 100% try to go down to 90% and you should see the ‘SAVE’ button towards the bottom.
Most browsers respond to the Control and the minus keys on your keyboard being pressed at once to minimize a view. If you aren’t sure, try holding down the CTRL key, then pressing the mins (-) key and your view should get smaller and the ‘SAVE’ button will appear. Conversely, to make a screen larger, you would press the CTRL and + keys.