Seeing as there aren't many available options for the flight there, we are considering economy. I have found the following flight on United.com

June 7th - 60k miles + $14
TPA-YYZ - 12:15pm -3:02pm (Airbus A320)
YYZ-BCN - 5:55pm - 7:35am (Boeing 767-300)

I read that you can reserve preferred seats at a cost. My tall legs would really like the emergency exit row. I don't see an option to reserve seats.

Can I do that by calling United? How does this process work?

Thanks again everyone for all your support.

Cheers,
Chris