How do I adjust the FONT SIZE on Safari 10?

On that page I can upload a photo of my choosing (and did, a while ago), but the only avatars I can use are the ones Apple displays, in the circles; I don't see an "upload your own avatar" button anywhere. Not a terribly serious problem, but where on the page can you input your own avatar image?

Once you have checked the box, does [option][command]+ work any differently than [command]+ did before? I'm wondering if there is really any point in changing the System Preferences/Accessibility.

I'm still with El Capitan, but unfortunately I "upgraded" to Safari 10.0, and I really don't want to try to reverse the procedure. I haven't started getting pushed to upgrade to Sierra yet, and when I do, I will ignore it as long as possible.

Here's a link to an earlier post of mine which explained the problem:

Re: How do I adjust the FONT SIZE on Safari 10?

(If this doesn't take you to my post, it's the long one on the previous page.)

Thank you for that explanation. It does work - but the control is too coarse; the text expands much too much, and I can't fine tune it the way I could with "Minimum font size", or the way I still can with the Terminal command.

I did check the box to which johnnylundy and AppleMacBrett referred (above), and afterwards, pressing [option][command]+ does affect the display - but in an odd and unsatisfactory way: it zooms up just the center of the page, and I can't scroll sideways to view the left or right margins! Pressing [command]+ works as it did before I checked the box, but works as I described earlier.

So it looks like the Terminal command is the only way to properly adjust the text size to my liking, unless Apple comes to its senses and reinstates the "Minimum font size" control.

"By the way, instead of typing or copying/pasting the line in Terminal over and over, you can also just hit the up arrow on the keyboard and that will bring up the last command you entered. Then you just edit the last 2 characters to change the size of the font."

Next to the Terminal solution itself, that's the most helpful post I've read on this whole thread! Thank you!

"The box in Accessibility is supposed to be Unchecked. Then keyboard won't zoom, and the option-command plus/minus will change font size."

That's where we started. On at least some computers, [option][command]+ does nothing if that box is unchecked.

"If you move the cursor to the edge, the rest of the page slides into view. This can be changed in System Prefs>Accessibility>Zoom then click options. You can set it so the page moves around with the cursor."

That's good to know, but you still end up with a page too big for the screen. If you're not bothered by that, isn't it easier just to use [command]+ to zoom the page - or for that matter, just use the two-finger "unpinch" gesture, which allows precise control of size, has no effect on page layout, and can be done on the fly without using the keyboard? (Certainly more effective than the one-finger gesture I've been using towards Safari these last few days.)