Launch your computer's Web browser by double-clicking its icon on the desktop.
Navigate to an online e-book conversion tool such as Online-Convert.com, 2ePub or ePubConverter.
Click the "Browse" or "Choose File" button, depending on which online conversion tool you're using, and navigate to the file you want to convert into an ePub e-book. Select the file in the dialog box and click the "Open" button. The file is uploaded to the online conversion tool.
Click the "Convert" button once the file has uploaded to begin converting it into an ePub e-book.
Select a location on your computer where you want to save the ePub file when prompted by the online conversion tool. Click the "Save" button to complete the conversion and save it to your computer.