The "I" that he is talking about is the one that blinks on and off.

it does not show up when he wants to copy.

he could try to use the mouse's pointer like a courser and try to click and drag may get the highlight affect.

once highlighted you could right click (the button you never use on the mouse)

right click when you got the pointer over the highlighted letters.
1. click and drag to highlight.
2. move pointer over highlighted address.
3. right click.
4. select copy.
5. I bet you will get that blinking "I" on the address bar so
so you should be used to that process as usual.