Move / Copy Inbox emails from Thunderbird to Yahoo Mail Acct


New Email
Hi All,

I need assistance on this ,

I configured my yahoo email account (POP3) in thunderbird , to my surprise it moved all my "Inbox" mails to thunderbird Inbox and now i am not able to check the emails directly from my yahoo account as all the mails are on my desktop client (thunderbird) as i configured the same to manage my multiple account at under the same roof gmail , yahoo, etc .i.e thunderbird and while when at home i can use thunderbird otherwise yahoo /gmail account directly.

So i need assistance on the following
1) How can i move back my inbox and sent emails back to yahoo account folders respectively .
2) What would be the setting to keep the mails on both .i.e Thunderbird and Yahoo account inbox.

Urgent assistance would be appreciated.