If your "SAVE" button is missing as shown in the image below, then you can zoom out in your browser to increase visibility.
To zoom in (or out) use the following key combinations:
On OS X Safari, Chrome, and Firefox all use Command (⌘) and Minus (-) or Plus (+) to zoom in and out.
On Windows Firefox, Chrome, and Internet explorer all use Control (Ctrl) and Minus (-) or Plus (+) to zoom in and out.
Simply zoom out until the "SAVE" button is visible.
PC vs Mac. Please reference the below.
Hold down the 'Control' button and hit the '-' to shrink the size of the screen.
Hold down the 'Command' button and hit the '-' to shrink the size of the screen