How can I download pdf free on this app?

Verify your email and send the confirmation

click on "PDF" tab, and search the book name you are looking for. Click on the book name, then scroll down, you will see the download button, when you click download button, it will require you to deduct the available point (you may refer point policy- there are several ways to earn points). Then once ready, it will pop up pdf and you just need to click save.

Go to the pdf tab (the menu list is at the bottom of the screen). Find the pdf you wish to download by searching the name (search bar is on the top right) and click on it. Scroll down a bit you'll see a download icon in a circle that also shows the number of times the pdf has been downloaded, click on it and the pdf will load up in a new tab on your browser. You may or may not get another list of download icons, if you do click on the one that says China (at least that's what I always do) and the pdf will load up in a new tab on your browser.
To download it click the menu icon (three dots on the top right of your browser) and click the download icon from the items at the top