HikaShop Paypal payment plugin in joomla 1.6?

How do I install the model of HikaShop Paypal payment plugin ?
in joomla
i put the url: www.paypal.com/cgi-bin/webscr .
and my PayPal Account : This email address is being protected from spambots. You need JavaScript enabled to view it.
and the paypal ip's :64.4.241.*,66.211.169.*,66.211.170.*,216.113.191.*
and it is Does not work.
What should I do?

Thank you very much.