A single igloohome SmartLock can only be paired to one account.
If you'd wish to allow the other party to perform admin control over the lock such as creating pin codes, viewing access logs and more, you could share your account details - Log in ID and Password with him/her.
Multiple users can be on the same igloohome account at once
IMPORTANT: Please note that by sharing your login details with another user, the new user will have administrative control over the lock as well. This means that they are able to change the Master PIN, delete, and pair the lock to another account. Therefore, do ensure that you are able to trust the other user with your account. igloohome will not be responsible should there be any issues arising from sharing your login details with someone else.