Apparently I’m sending myself + others spam emails…

just checked my spam folder in yahoo and my own name was in there sending spam links to myself and other people in my address book. How to stop this?
Answer #1
I think you’ve been hacked, someone knows your Yahoo! password
Answer #2
change your password
Answer #3
Change yer password happened to me with hotmail hackers were sending virus to all my contacts
Answer #4
ok done thanks.