Login at Godaddy and select Domains Management.
To Edit an A Record
In the A (Host) section, next to the record you want to change, click Edit Record.
Edit any of the following fields:
Host — Enter the host name the A record links to. Type @ to map the record directly to your domain name, including the www.
Points to — Enter the IP address your domain name uses for this host record.
TTL — Select how long the server should cache the information.
Click Save, and then click Save Changes.