install the most recent QuoteLink for Schwab add-in sch.0.16.4 or later
install the most recent QuoteLink for Excel add-in ql.0.82.14 or later(you might already have it)
find the green qL icon which is on the icon tray at the bottom right of the screen
Use the menu login Schwab
After authenticating push the bottom Authorize QuoteLink
Once you have authorized QuoteLink:
Open the example spreadsheet . It shows how to request stocks, indices, options and FOREX.
It lists all available fields and all FOREX currency pairs available
If you have the professional version install the symbol lists add in sl-0-12-3 which is used by the spreadhseet to produce options chains