Hello! I've added those domains to your account for you. Please note that it may take up to 2 hours for the domain changes to take effect. If after a full 2 hours it doesn't work on your side, please make sure you clear your web browser cache: https://wiki.helionet.org/Clear_Your_Cache
An admin can help you change these later on if you want, by deleting the domain(s) you don't want and adding new ones. (It wouldn't really be a change, more like an add & remove.) You can have up to 10 domains total (including addon domains, subdomains, and aliases (parked domains)) on your account. You can read more about addon domains here.