deleting e-mail address so that it can be reloaded

Due to changes of servers used by BT, we have had to reset all of the technology in the house, but I got stich when I looked at my laptop, as I could not find out how to change the details to start again even though its the same e-mail address.

I was used to using windows 7 but windows 8.1 is causing me some problems
Perhaps this is caused by my brain illness, and that is not helping me

Ken

Thanks I will try this later when I can think clearly. It is annoying as the details are all correct, but the new BT server will not accept this, which is why I need to delete the details and then reinstate them

I loved windows xp but windows 8 is totally different

Thank you for your help