Hi Bargainscot, A warm welcome to eBid. You can pay your fees with paypal. Ebid sends out an invoice with your fees at the end of each month. On your eBid page if you look at the right hand side you can click on the fee section. When your invoice comes through you click on the tab on your fee page that says 'My eBid invoices' and from there you can pay by paypal.
As the others have said if you want to stop your 7 day subcription before the end of a month you must cancel it yourself otherwise they will keep charging you.
Any subscription fees you pay will get taken off the lifetime offer should you want to go for that in the future.