Access the source account Web console (this is the account that will be canceled).
Click Manage accounts in the Preferences window. You will be taken to the Account management window.
Select Merge.
Enter the Login Email of a user with total control permissions on the account to transfer the data to, as well as the client number (identifier) provided in the welcome message.
If you're sure you want to merge the accounts, click Merge.
Related topics
Requirements for merging accounts
What information is transferred when merging accounts?