adding my existing email to thunderbird

I'm presuming you are getting some message about password or user name is wrong ? You also do not mention whether you are trying to set up imap or pop. Spectrum has taken over TWC. The following is copied text: Server Settings Based on Domain (@example.com) Brighthouse.com, bak.rr.com, bham.rr.com, cfl.rr.com, emore.rr.com, eufala.rr.com, indy.rr.com, mi.rr.com, panhandle.rr.com, tampabay.rr.com * Incoming Email Server: mail.brighthouse.com * Outgoing Email Server: mail.brighthouse.com TWC.com and any domain ending in .rr.com not covered above (this could be you as you mention time warner) * Incoming Email Server: mail.twc.com * Outgoing Email Server: mail.twc.com '''IMAP '''is the preferred method that spectrum would like to to use. * The incoming mail server: mail.twc.com * Incoming server port: 993 * Connection Security: SSL/TLS * Authentication Method: Normal Password * User name : email address '''POP''' * The incoming mail server: mail.twc.com * Incoming server port:110. * Connection Security:None * Authentication Method: Normal Password * User name : email address '''SMTP''' * Outgoing mail server (SMTP): mail.twc.com * Outgoing server port: 587. * Connection Security: STARTLS * Authentication Method: Normal Password * User name : email address