The easiest way to load your Slick Ereader is to use the Calibre.com program.
It will convert almost any format to Epub and with the click of your mouse, you can load an unlimited amount of book directly to your Slick Ereader.
When setting up Calibre, use the generic ereader and it will sync to your Slick effortlessly.
Calibre is an excellent program for organizing your ebooks for any format or ereader. When adding more books, it ill alert you if it finds duplicates.
I have found the Slick to have a few problems with Pdf files so I convert everything to Epub and haven't had any problems.
Have a great day and read!