Find the hints to substitute numbers for the letters.
From the tab, you know that R = 0
From the highlights, you know that N = 3 and U = 9
From "Save as" you know that E = 1
From "Source code" you know that F = 8
You will be able to deduce the other numbers from the addition problems.
O = 2, T = 4, W = 6, I = 5, V = 7
Add the six-digit numbers together. Substitute the letters for the numbers in the answer.
If I've given you the right information and you've added correctly, the answer will be winter.
winter
winter
The answer is winter.
wires
yesterday
heart
whywoolyowl
horseplay
The answer is yesterday.
The answer is france.
044
eye