Note that you simply need to restart a new subscription payment plan for your existing E-junkie account; you DO NOT need to register a whole new E-junkie account from scratch.
Also bear in mind that the PayPal account that sends us your monthly subscription payments is distinct from the setting that determines which PayPal account receives checkout payments from your buyers; these can be the same PayPal account or different ones, but one does not affect the other.
If you need to update which PayPal account receives checkout payments from your buyers, that would be determined by your E-junkie Seller Admin > Edit Profile > PayPal Email setting.