Your BibliU library allows you to print a specified amount of pages from your e-text. The amount of pages that you are able to print is based on the publisher restrictions for your e-text, and will likely vary from title to title.
In order to print, first log in to your BibliU account, and navigate to the title that you would like to print from. Once you are in the title, click on the icon in the upper right hand corner with three dots, and select "Save to PDF".
From there, you can select the page numbers you would like to print. You will also be able to see how many pages you are able to print, which will be reduced by the number you print every time you do so.
If you do not see the "Save to PDF" option, it is most likely due to the fact that the publisher does not allow any printing from the specific text that you are in. If you have any questions, please feel free to reach out to email@example.com for more information.