For example, when posting here. I have several paragraphs of text, yet want to
scroll up to correct something. *If I use a finger or stylus, the page scrolls,
not the text within the box. *How...?

Use two fingers to scroll inside the text box instead of one. This works with most (not all) frames and views in Safari.

cool tip i've been having that problem for a while. thanks also to the OP.

I tried that with no luck. Just tried it here again and the box enlarges but I can't scroll up.

It takes a little practice, since two fingers also do the pinch/zoom thing. What works best (for me) is to let your two fingers touch lightly while trying to scroll. Both finger must be inside the box, which can get a bit tricky, so sometimes zooming in first helps.

Hold finger on the screen in the text box on a word till you get the magnifying glass. The scroll up or down.