I don't know about IOS, I think they don't use GG(?) If they do, I'll try to help as good as I can and this video is not from me. Found it while googling.
Wich window do you mean?
What he is doing in the video is searching the value of how much energy you can buy 10;30;60.
Then when found, he only searches for the 60 (not sure if it makes any diffrence when searchong for 10 directly but to stay safe, I just followed what he did)
Once he finds all values that are 60, he changes them (I did 10 at a time, didn't count how many he did) to 120 (mini. GG/ closes the energy shop and opens it again too see if the value changed)
If it doesn't change then "Revert selected values" because it might or probably will crash the game. Delete them from your list and go on with the next 10 untill the 60 Energy changes to 120.
After you found the 60 Energy value ( in video he changes it to 100k to make sure its really is the value he is looking for)
Search for the address - after that he goes 11 values above the one he searched for. You should have the same one as he dooes when he goes 11 up "30D; 4.2038954e-44F;" thats for the 30 energy.
After that, go from there another 11 up intill you find "10D; 1.4012985e-44F;" thats for the 10 Energy that cost 20gems. Change that Value to 100.000 (not sure if it effects the game if you use a higher number)
Then go out of the shop and back in and you should be able to buy 100k Energy for 20gems. Then go back to GG and revert the address to how it was befor.
I hope this helps, I suck hardcore at explaining. The best I could do with my skills at understanding.