Can two people be on the card or no.

Each paid membership includes a free household card.

Yes

Yes two people can, as long as it's the same address.

Yes. Two people. And you must use same address, but the two people could live far apart. My friend lives and has his membership in KY, but when he came to visit me here in LV, he added me to his membership. I never had to give an address.

Only from the same address.