Schoology: How do I Unlink accounts?
To remove a link with another account, follow these steps:
1. Click on the downfacing arrow on the upper right of Schoology.
2. Click Account Settings in the dropdown menu.
3. Scroll near the bottom of the Account Settings page until you see a list of your linked accounts.
4. Click on the x to the right of the account you'd like to unlink. This action will remove the link with your other parent account and the child associated with the account.
5. Click Unlink Account to complete.
Note: You may only remove linked accounts; You may not remove a primary account. Once an account is unlinked, you may login to each account using their respective login credentials.
https://support.schoology.com/hc/en-us/articles/206125027-How-do-I-Link-Accounts-