Linking School and Personal Accounts

As per the 1st August Terms of service item 1.8 (see below)

How can this be achieved ?

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1. 1.8 Linked Accounts. Khan Academy may permit a User to associate a personal account with their School Account, by using the login credentials associated with a personal account to join a class or use the account for school-directed learning. If a User chooses to associate a personal account with their School Account, the two accounts will be deemed "Linked" Accounts, and the User's learning activity (information regarding use of the Website generated by the User through use of the Website), whether generated during or outside of the school use, may be viewed by any person with access to either account. "Linked" Accounts are not separately functioning accounts; they permit access to a singular Khan Academy account using more than one account interface or set of access credentials. Linked Accounts may benefit Students who want to use the Website for both personal and school purposes, by allowing School Personnel to have a deeper understanding of Student progress, and by allowing Users to keep track of all of their Khan Academy learning activity on an aggregate basis. The User's election to enable account linking must be made, if at all, in connection with the initial account registration and rostering process for a given school year. Once accounts are linked, they cannot be separated. Khan Academy may (but is not required to) enable linking of accounts as described herein. Upon any termination of the School Account by authorized School Personnel, the User's learning activity (including any learning activity from school use) will be retained in any Linked personal account."