Hi there @Kthoimson,
Thank you for your post and welcome to the PayPal Community Forum!
You may need to contact the merchant to change the date of your billing agreement or subscription.
However, you can edit the funding source of a billing agreement and make a number of other changes. Please see these steps: What is an automatic payment and how do I cancel or update one?
I hope this helps. Have a nice day!
Rebecca
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