When you first open Adobe Digital Editions you should be prompted to authorise your computer. If you are not, click on 'Help > Authorize computer'.
A 'Computer authorization' screen will appear. If you have an Adobe ID, choose 'Adobe ID' from the 'eBook Vendor' menu and enter your Adobe ID and password.
If you do not have an Adobe ID, you can create one on the Adobe website by clicking 'Create an Adobe ID' and filling out the form.
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