To set a new custom A record, click on the “Add New Record” button, then select the desired domain from the Hostname drop-down menu. Choose “A” for type, then fill in the value field with the IP address of the server where you want to point your domain to.
Note:Please note that each hosted domain and its pertaining subdomains already have an A record assigned and by rule a domain/subdomain can have only one A record assigned. This is so, because if two A records are enabled, the domain/subdomain will resolve randomly on each one of them.