Installing the card isn't very difficult. Begin by reading the manual
that came with your computer. Look for the section about installing
expansion (or "option") cards. It will tell you how to open the case on
desktop machines. Next, consult the manual that came with the Ethernet
card. It will explain how to install it securely into the machine. There
are so many different makes and models of computers, that this document
can't be definitive about these steps. But for this "mechanical" part of
the installation, this document will provide a generic outline that will
help keep you on course.