First, install an Android application on your Tab. You can do this by installing any of the Android application mentioned in this link: https://blogs.adobe.com/digitalpublishing/supported-devices
Search for "Android application" under the Application or mobile/tethered device column. For ex: DL Reader or Bluefire Reader etc.
Make sure to authorize your reader with the same ID that you have used to authorize your PC
Then you can try any of these:
1) Transfer the .acsm file from your PC to your Tab( via mail or an SD card) and fulfill it using the reader. This will work for all books(borrow/purchase)
2) Transfer the epub/ pdf (right click on the book to be copied in the library and select "Show file in explorer") from your PC to your Tab and open it in the reader. This often might not work for borrowed books.
I tried your method. When I download DL Reader from internet, there is no authorize button for me to key in my ID in the reader. What shall I do?
Click on Settings->Account in DL Reader. Please check for this option