Hi nannygorgeous,
Welcome to Question and Answers..
Here what to do..
First you need to Log-in to your My Sony account, using the details that you used to register your Reader. Click the following link - My Sony Log-In - https://www.sony.co.uk/mysony
Once logged in click on the blue Product Details & Extras button next to your reader model..
In your Reader models product page click on My Offers..
Under the information about the 100 free books you should see 5 Click Here For..... links..
Click each the first collection of books you want to download
Then Save the file to your computer (for example, to your My Documents folder)
Once the download has completed locate the Zip file you saved on your computer
Right-click on the file and choose extract
Open Reader for PC or your eBook Library..
If you want to import individual books then go to the File menu and choose the Import Files option
Find the files that you have just extracted, select them and click Open
If you want to import the whole collection then go to the File menu and choose the Import Folder option..
Find the Folder that contains the selection you want to import select it and click Select Folder..
Finally connect your Reader to your PC & Sync (add) the books to your reader..