Welcome to the board. Glad you joined us. I am sure someone with one of these devices will be willing to help you out but it might take awhile, so check back and give it some time.
Also try downloading aldiko app. This is good for pdf and epub files. Kindle only reads mobi files. There are other good readers if you can get them to work on your tab such as moon, I.reader etc
Of all the ereader software I have tried, and that is most of them I think, I've found FBReader to have the widest compatibility with different formats.
Of all the ereader software I have tried, and that is most of them I think, I've found FBReader to have the widest compatibility with different formats.