Welcome, Seadog.
The bonus works like this:
You need to get a passkey from
here, then enter it into the client, either during installation or through one of the control panels (Web Control->Change Identity or Advanced Control->Configure->Identity tab).
Once it's entered, you need to prime the passkey by completing 10 bonus-eligible Work Units; before that, you will only be getting base points. All WUs run on your CPU are bonus-eligible. Currently there are some issues with the servers that give out bonus-eligible GPU WUs, so most of the WUs that your 670s get only earn base points no matter what and will not count towards priming the passkey.
The bonus points are credited based on how quickly you return WUs, and is calculated from the time that the WU is sent out to your computer to when it's returned. If the piece of hardware folding a particular WU is not running because you're gaming, or the computer is off, etc., then the bonus points will continue to decrease during that time. The bonus equation is exponential, so halving your return time would more than double your Points Per Day; the Pande Group
really likes WUs returned quickly. But don't feel bad if you want to game or do something else.
If by "this account" you mean your EVGA account, then the passkey is not directly linked. FAH publishes everyone's stats publicly. EVGA grabs its members' stats and keeps track of them locally. So, having a bonus-qualified passkey will earn you a lot more points, which EVGA will see, but EVGA is not in any way responsible for the passkeys themselves.
For sig banners, see
here. Note that you need to be in EOC's stats database first, which means you need to have completed at least one WU and wait a few hours. FAH updates its stats at the top of every hour, while EOC, which uses the stats that FAH publishes, only updates every three hours.
One thing to watch out for is that FAH's stats servers don't usually get around to WUs that were returned too close to the update, and EOC will be similarly delayed. So, if your first WU was turned in at 8:46 am CT (the time zone that EOC is in), FAH's system will in all likelihood not credit that WU on the 9 am CT update, meaning that EOC won't credit it in its 9 am update. It should be handled by the 10 am FAH update, which means that EOC will get to it in its 12 pm update.