We just got started!

Hi, my name is Beth. My boyfriend and I just got started with Myfitnesspal. So far I'm finding the tracking and finding foods fairly simple. I do have one question though. I got hungry for popcorn and I popped bag of Weis Quality Popcorn Movie Theater Extra Butter. I know, not the best choice but it's what I had. When trying to add it to my diary, I was unsure how to add it since the totals on the box show ony the unpopped calories and other totals. They only give the calories for 1 cup popped which is 35 and the calories from fat which is 20. All the rest of the totals are in percentages. Please help- How do I convert these percentages to numbers. For example; in 2 TBS of unpopped the total fat is 10g. The total it gives under the 1 cup popped side is 3% of the daily total for fat.

I added this food to the database with all the totals for the unpopped. Sorry I know this is long but would really appreciate any help.
Thanks!