When you download eBooks for the first time to your mobile device, you first have to:
1) Download an app that supports Adobe DRM from iTunes or Google Play (Apple: Bluefire Reader, Android: Aldiko/Bluefire Reader)
2) Create an Adobe ID, if you haven't already got one
3) Activate your Adobe ID in the reader's settings (see pictures below)
You are now ready to download a book from the e-book collection you've chosen!
More instructions, see eBook Databases: Find and Compare
My Adobe ID is not accepted.
There can be many reasons for this. Try to sign in to your Adobe account in the browser. You can also try changing the password. NB! Adobe will not allow you to have more than one Adobe ID. If you forget your user ID, do not create a new ID with the same personal data. This could cause your ID to be blocked.
Your Adobe ID can be activated with a maximum of 6 apps/devices. If you reach the limit, you will have to deactivate your ID from some of the apps (app settings->deactivate)
With iPad, use Safari for downloading books. Other browsers may cause trouble when downloading the book file.