JP Morgan Chase - overdraft limits and fees

Does anyone know the specific procedure for increasing an overdraft limit at JPMorgan Chase?
Do I need to submit a formal written request, fill out a specific form, or something along those lines?

To give you some context, I’m currently sitting at a deficit of $2300 (roughly one paycheck), and I have $2300 approved for installment payments. However, I actually need to increase my allowed overdraft to about $0.00. Are there any typical hurdles when requesting this, and how long does approval usually take? I believe I'm using that flexible credit option.
Thanks

A buddy of mine just started a new gig last month. He set up his mobile banking over at JP Morgan Chase, and since his employer uses them too, everything should be streamlined. If his first paycheck hits the account this coming Monday, how long does it usually take for the system to automatically approve an overdraft on his checking account?