Why is it after I finish registering on Paypal I didn't receive their confirmation email it's been 2 days.
Did you use the correct email address or check your Spam folder. If all else fails, give PayPal a call and they'll get it taken care of immediately.
You just MIGHT want to add them to your safe list. Of course, if you want all of your payment notices to go to your spam folder, don't change it.
I am using Hotmail address with paypal and when I receive an email from paypal. A green shield icon appears in the mail title which means the mails are trusted. Cant imagine why other mail services consider it as spam.
If you've provided the correct email address then check your spam/junk mail lists, sometimes emails will be skipped from the inbox.