You'll need to enter your products in the database....ask your host how to
set up the database, and ask the author of the shopping cart applicationhow
to use it. (They ought to have support of some description - an email, phone
or even a support forum to ask questions such as this).
Is this actually a Frontpage question?
You've given us nothing in the way of helpful information such as type of
host (linux, windows), type of database (mssql, access, mysql etc), what
shopping cart application you're using.
Please post back with that info and we can continue to assist, but
otherwise, please seek advice elsewhere (as mentioned above, your host and /
or the author of the shopping cart application) if this question does not
concern Frontpage specifically.