If you’re using DropBox on your computer then your computer will be linked to a particular account. IF someone else Is using it then you’ll want to connect your DropBox software to another account.
There’s an easy way to do that. Right-click the DropBox icon in the system tray, and then click on preferences.
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There, click on the account tab, and then click on “unlink this computer”. Then, you’ll be able to connect whatever account you like.