Note that E-junkie works with the standard, default settings in your PayPal account. You should only need to change settings in PayPal if you have already changed those settings before (so presumably would remember where they were :^).
If you just want to look over your settings to be sure, see our PayPal integration help page here:
http://www.e-junkie.com/ej/selling-with-paypal.htm
(and note you can click on Website Payment Preferences there, which will take you directly to that page in your PayPal account if you're logged in there).