If you have a Kindle, then that's easy - choose Kindle. This is the "mobi" format.
Most other eBook devices (Nook, Kobi, Sony) use the "ePub" format.
iPads and tablets with eBook apps will also use the "ePub" format.
If you have an eBook app or program on your computer, you can use the "ePub" format.
Computers and tablets can also use a PDF format, though you won't have the cool page turning mechanism.
Where do I get an eBook app?
Remember, on a computer, you can simply use the PDF format. The eBook app is just spiffier.
eBook devices (Kindle, Nook, Kobi, etc.) have apps built in.
Tablets, iPads, and Windows 8 have eBook apps at their respective app stores. They should be free.
Computers can download free eBook software from the Internet. Try Calibre-Books.com.
Which option should I use for the free stories?
The simplest way is to choose the "Read Now" option. All devices and computers can read this PDF format.
If you have an eReader device (Kindle, Nook, Kobi, etc.), then you can use the Kindle (mobi) or eReader (epub) option. If you have trouble, try the ZIP (epub) option.
If you want to use an eBook app or software on your computer, tablet, phone, or iPad; then you will likely have to download the ZIP format and extract it on your device. I know, it's getting tricky. Again the "Read Online (PDF)" option is easiest.
Downloaded files will have a name of random numbers. Sorry about this. This is a limitation at our website host.