So you need to funnel all your money into a new bank account? This setting is actually on Stripes end, not PushPress. Its relatively painless, here are the instructions.
Login to Stripe:
Your email is most likely the same one you use for PushPress or whoever established your PushPress account. If you don't know your Stripe password which is highly likely as you have never logged in before, use the 'Forgot Password?' in Stripe.
Update Bank Settings:
Look at this page for instructions: