When you use the ‘Read Online’ option in VLeBooks, the e-book is opened in a pop-up screen.
By default, most iOS devices automatically block pop-ups. If you find that ‘Read Online’ is not working, then you may not have pop-ups enabled on your device. You can enable pop-ups for specific sites by adjusting your browser settings. You only need to enable pop-ups for the website www.vlebooks.com.
How to enable pop-ups