No. You can NOT let anyone else present their course on your mastermind.com account unless they meet one of the following two criteria.
If the owner of a mastermind.com account is a business than any owner or manager can present a mastermind course on that account. Owners and managers must be listed on official business documents.
If the owner is a person who is legally married then the couple may share a mastermind.com account and both partners may present their mastermind courses on that account. In the event of a divorce MM.com is not responsible for ensuring either party has access to the account without a valid court order.
If you want to have a guest appear with you on your mastermind.com course please go to the following article.