Changing incoming server settings
Please help!
I have a Mac 27" update to Yosemite 10.10.2. I have 25 GB free in storage. I have been having trouble with road runner email and found out today that they are changing their email settings. How do I change the incoming mail server settings in Mac Mail from pop-server.columbus.rr.com to mail.twc.com? When I get to preferences and account information the incoming mail server is grayed out and therefore can't be changed. I just found out I can't delete the account because it is being used by 'Internet Accounts'. When I open Internet Accounts it asks for my password but won't accept it because I can't connect to the internet due to the settings being wrong.
iMac (27-inch, Late 2013), OS X Yosemite (10.10)