Go into settings the cog symble at the top. Click Payments options at the bottom of the page and click pay after delivery link, 2nd one down, you should have a link that states pay after delivery when you click this your bank account will now show up, from that page you can click the link on the right of your account to to turn off pay after delivery. I know thIs works as just done it myself, though this was from an Android tablet, it should be the same using a phone or pc.
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