
When you purchase an Index Fund it will be under the "Mutual Fund" section.
$3000 is the minimum initial investment.

Reinvesting the cash back into the fund will help it grow faster.

This page is to helping you to remember that this is a long-term investment.
The cost of $17 is higher than the usual $7 because it is an Index fund instead of individual Stock.
I believe if you have a Vanguard account, they don't charge you the $17 cost.