Can't View My Regular Mails In Yahoo

Hello everyone! I guess this is a rant that I will be sharing today. I messed-up my yahoo account yesterday and can no longer view my mails in my regular yahoo inbox. What happened was, I tried to sign-in my yahoo email add to Microsoft Outlook and after doing it, all my mails were transferred to Microsoft Outlook inbox. Honestly, I am still not comfortable using Microsoft Outlook because I am always using the regular yahoo mails.

The worst problem is, when all my yahoo mails were redirected to Microsoft Outlook inbox, all the spam mails in my yahoo spam folder are all now in the regular Microsoft Outlook inbox. Imagine I have more that 1000 spam mails back in yahoo inbox. I can't find enough time sorting the mails in Microsoft Outlook. Second problem is, I cannot find the "Product Key" of this new laptop on mine. I thought this is the product key that is found at the back of the laptop but everytime I input it, it always says, "wrong product key".

I am still trying to search on how to have back my mails in my regular yahoo inbox and not at the Microsoft Outlook inbox. This is truly a catastrophe for me because I have some important mails in my yahoo. I was so sad after this happened yesterday.

I hope this problem will be fixed soon. Any idea who I can fix it? I mean returning to my regular yahoo mail. This is the problem of not being a computer geek and have no knowledge of any computer programming.