2. Then open the epub format file: click the "Add Book" button in the upper left corner and select the e-book to be converted.

3. Select the book whose format you want to convert in the list, and then click the "Convert Books" button.

4. There is "Input Format" in the upper left corner. Select: MOBI format, which defaults to "metadata".

5. Then click Set Profile, you can leave it unchecked and use the default page size. Finally, click OK to start the conversion and wait for the conversion to complete.