Now proceed with the "Go" next to "Set up your payment solution".
You may see a form asking what you intend to do. As far as HotDoodle is concerned, all you need is processing payments on your website. You may chose the other options, but be aware that while PayPal charges no monthly fee for the website payments, support for some of the other choices incurs monthly charges from PayPal.
You should see "Website Payments Standard: Solution Overview". If this is not what PayPal recommends, you can chose to click it instead. ( You can always ass the other PayPal services later if you need them).
When you hit "Continue" you may be taken back to step 3.
If you click on "Go" from here you will be taken to a page that describes the payment service.
Oddly, while this page says many things about this service, there is no "sign up" or "proceed" link. Moving forward from here takes some non-intuitive steps.