Chin up, you just need to get it set-up correctly. The thing is, you don't really have an eReader, you have an Android tablet.
Can you access email from your Cruz reader? If so, I believe you can put that email address in here and then use your reader to open the download link.
http://www.androidzoom.com/android_a..._download.html
You might try asking in the Android section here or calling Kobo/Borders Customer support.