a. Go to the 1and1.com home page.
b. Click on the Customer Login link at the top of the page.
Enter your Username and Password in the boxes, and then click the Login button. You are now logged in to your 1and1.com account.
c. Click on the Manage Domains link on the left hand side.
This will open the Domain Overview page.
d. Click on the DNS link. Select the domain you wish to manage from the pull-down list, and click on the Next button. This opens the DNS Settings page for this domain. Go down the page to Name Server Settings, and click on Edit.
e. Now go to the box called Basic DNS Settings, and select My Name Server. This will open the Advanced DNS Settings box, and you can now enter the new DNS settings in the boxes.
f. Now click on the OK button at the bottom of the page.
This will take you to a screen that will confirm that the process is completed, and the DNS settings have been saved, and your domain will be updated accordingly.