I've refunded the hosting charge for you and the funds should return to your account within the next 2-3 business days. Yes, you can use the domain with a third party company. After 60 days you can transfer the domain to another company, and in the meantime you can point the domain by updating the domain nameservers or IP address. You can access the dns panel by clicking the dropdown in the top right corner, then Domains. The manage option will show if you click the three dots to the right of the domain name.
