The steps to download e-books on ZLibrary are as follows:

1. Open the website of ZLibrary.

2. Enter the title or author name of the book you want to search in the search box, and then click the "Search" button.

3. Find the e-book to download in the search results, and click the title to enter the details page of the book.

4. On the details page, you can check the author, ISBN number, publication date and other information of the book, and select the e-book format you want to download.

5. Click the download link and select "Save File" to save the e-book locally.

ZLibrary is a free online digital library, which provides a large number of e-book resources and supports e-book downloads in various formats.