After resetting the computer (by disconnecting the battery for 5 minutes or so,) take it for a ride for about 15-20 miles - mostly hiway miles, not stop and go. Do not drive it hard or soft, just drive it normal. That should reset at least 2 of the 3 Portals required for emissions testing - all that's required.
Usually the last one to set is the evap system - gas cap, charcoal canister etc.
Make sure the gas is fresh, filled within the last 2 weeks.
And -- add a 1/2 pint of Denatured Alcohol (hardware store) to the tank - same thing as the "Guaranteed to Pass stuff.