Once you are logged in, click the Recurring Donations link also located at the top of the page. You will then have access to your recurring plans.
Click the Edit button to the right of the donation plan that you wish to edit (see image below).
To change the charge date, click on the Set Next Donation Date textbox. After choosing the desired charge date, click the change button.
Note: PayPal does not give us the ability to change recurring donation date.