can't read email using my primary apple email account

Ok, I'm new to this forum but here is my problem

Usually I can read Email using my primary Apple E-mail account BEFORE I updated my Ipad into IOS 8.

After I updated my Ipad into IOS 8 (non-jailbreak and from IOS 5 jailbreak), My Ipad says that I need to sign up an Icloud email to use the Mail App.

Then I can't use my Primary Apple Account as an E-mail anymore. When people send a mail to my primary apple account, I cant read it because I cant read emails using my Primary Apple Account anymore.

When I signed in with my primary apple Email account and opened my Mail App, It used my Icloud email instead my primary apple email.

I tried everything Include making an email aliases but my primary apple email uses @Yahoo.com and I can only use aliases of @Icloud.com

Can someone please help me so I can read E-mails when people send an Email to my primary apple account? Because I need to see those subcription mails and change my password of my online game account(<- This one is URGENT).

And sorry for my bad English because I'm Indonesian.