Originally Posted by Zacnlinc

I'm not completely sure about the exact location of the button. But when I upgraded the parents last month from MCE to F, there was a red button to the right that was clearly marked as an uption to upgrade (to first). I scanned perhaps too fast and did not notice if there was a different color box as an option to go to MCS as I was focused on F seats.

But you will see it! It's not hard! And again, Good Luck!