Grading Help!!

[RookieFan15]

I have not submitted to BGS in a couple years and decided to give it a shot with their current promotion. My question was where do I mark my minimum grade? Maybe only PSA does it but I thought BGS did too. I printed out the form and as I said I do not see a place for it. If it does not meet my requirement do they still charge me the grading price? Also how hard/easy is it to crack the case without ruining the card? Thanks any help is appreciated. Would love to hear some replies soon since I want to ship it out today!