1. Sign into Manage services
2. Click on Manage your domain names, which is under Domains
3. Once in BT Domain centre, click on Manage in front of the domain for which you want to update the TXT records
4. Click on Advanced Domain Manager on the top-left hand corner of the Manage page so you can see the records currently on your domain
5. Add a TXT record on a blank row at the end of the current list following this format
6. Click Save
Changes can take up to 24 hours to take effect