Email setup on Outlook

I have 2 email accounts on ntlworld which were working fine on Outlook until Virgin decided to make things more secure. I have set up an external mail address on hotmail for one account but do I have to have another external account for the 2nd ntlworld account ?  None of the accounts work in Outlook. It is so confusing now as never know what username to use where as I now have 2 accounts plus an external account to log into and don't know which I should be using. Virgin are of no help as at 70 and hard of hearing I can't understand the heavily accented support lines.