You must login to your Control Panel Login , Enter you username and password and hit 'sign in' to continue.
In the Zone Editor, click the 'Edit' button of where you can see your IP address. Clicking 'Edit' it will allow you to change your IP address so you may enter your new IP address. If you have verified that it's correct you may hit 'Update Record' and click 'Save Reload' . You will see a pop up message Success : DNS Zone updated successfully. Note : Updating DNS could take up to 24 hours to propagate.