The link will either download the pdf file or display it depending on your browser settings. It is is shown to you can can choose to save it from the inside that viewer app.
The pdf file contains clear images and gives a full account including how to convert a deal on paper into a lin file that can be easily uploaded to BBO.
The ultra short version is
First login to BBO, go to Hands and Results and create a folder.
Click import (purple dots)
To add hands that are not in a lin file see the post
How do I - Enter (Type) Hands into aaBridge