Hi I want to crack Gmails with that tool and I have some question.
1.Is that work for Gmail? If not with which method I can do?
2.How I should find my gmail target?
3.How can I find password list?
4.I know gamil have good security level. which other mail services I can try with low level security?

You have specific target or you want to crack random emails ?

the thing you want to do is BRUTE , tou need WORD password list to add in base , and then group your targeted emails with it , and brute the mix , but still you can find problem because of authorize gmails has with SMS confirmationt's