If you already have a talktalk.net email address then just sign in to TalkTalk Mail here.
If you're a TalkTalk customer and have registered for MyAccount then you can create up to 5 talktalk.net email addresses in MyAccount > My Services > Manage Webmail and here's the article to tell you how to Manage your email in My Account.
Using TalkTalk Mail is a useful guide. Just say if you need any additional help.
How's it going?
Just in case you need assistance from the TalkTalk team, please update your Community Profile Personal Information (Click here) to include your name, current contact 'phone numbers and address with postcode (location) then scroll down and add the email address to Private notes and Save changes.