Yes, I am working on a Mac. I am using TTDeluxe. I will try to talk you through it.
Make sure you are in Forms Mode (Icon at upper left of screen)
Open 2210. If block A is checked, go to line 17. (This is counter intuitive as the instructions say File Only Page 1 if you don't owe a penalty and line 17 is on page 2). Once you are at Line 17, you should see text that says, "QuickZoom to Waiver Explanation Statement". Click the button and a window will open for you to write your explanation. Note that text does not wrap. You must Enter to go to a new line otherwise TT will reduce your explanation to very small font and put all of it on one line.
When you have completed your explanation, move on to another form. If you have been successful, on the list of forms used in your return you will see 2210 and underneath it offset to the right you will see Statement of Waiver in abbreviated form.
Incidentally, if you have made Estimated Payments quarterly as I did, the total amount will show on line 12 of 2210.
Good Luck!
