You will need to select the domain name, select "lock", then select "no", then you will need to re-select the domain name and click "change account." You will then need to enter the person's username and email address that is receiving the domain name. That individual will then receive an email from dynadot and they will need to click the link contained in the email. They will then have to click "accept account change." The domain name will be in their account.
Entire process should take no longer than 4-5 minutes.