To withdraw your money, log into your WePay or Stripe account with your username and password. From there, you'll be able to set up withdrawals. In WePay, the first time you do this, you'll be asked to enter in more details about yourself or your organization and your bank account details. You can have WePay or Stripe withdraw to your account daily, weekly, or monthly.
Note: With WePay, you must enter bank details within 14 days, otherwise you won't be able to raise further money on your fundraising or ticketed event pages until you do. You also must have a US Tax ID number to raise money via WePay. Stripe asks you for these details up front, and is available in more countries and currencies.