Assuming you're paying the band members by a direct payment from the bank account, like a check or Venmo transfer, you would enter each payment as a Withdrawal transaction, with Received By and Shared By both set to the user receiving the money and Withdrawn From set to the bank account. These individual transactions in BandHelper will match the individual transactions in your bank account register.
If you made a single cash withdrawal and then paid each band member from that cash, you would enter the withdrawal as a Withdrawal transaction, with Received By set to you and Shared By set to all the users receiving the money (including you if you are paying yourself from this cash). That shows the money moving from the bank account to you. Then enter a Distribution transaction, with Paid By set to you and Received By set to the users you're paying (not including yourself), and enter the amount each user received in the Shares fields. Alternatively, you can enter a separate distribution transaction for each user you pay (not including yourself), with Paid By set to you and Received By set to one of the users you're paying. That shows the money moving from you to your bandmates. The amount you withdrew minus the amount you paid to your bandmates is tracked as your personal income -- you do not need to enter a separate transaction for that.