Good morning,
I understand you’re trying to change the administrator on your laptop because your son’s account is currently set as the admin.
That usually happens when the first account created on the device automatically becomes the administrator, which controls settings and permissions.
To fix this, you’ll just need to adjust the account type. If you’re on Windows, log in to the admin account, go to Settings then click Accounts then Family & other users, select your account, and choose Change account type then Administrator.
After that, you can switch your son’s account to a Standard User so it’s safer.
If you don’t have access to his admin password or if you’re on a Mac, could you let me know?
Regards, Aron