Thanks for the recommendation!
I have seen the tutorial (video) again and followed the indicated steps ..., in the end I moved the Excel to the desktop and proceeded to make the copy of the link, in the end I got the following message:
In the end I have manually edited the second variable (Year and Cmer) and added the LinForest function (Instead of Interp).
Did I miss any step that the function (interp) does not come out automatically? and I do not understand the function decreases in the first year and then it grows?