Q: "Should we not try to answer a question if we already have the prize?"
A: You can still answer even if you have the card. After that, you can do whatever you want with the card like keeping, giving it away or sell it.
Q: "Can we guess the answer?"
A: Yes you can but you cannot answer that same question again after you have posted your answer for that question. You can only answer the next or new question.
Q: "When do we get the prize if we win?"
A: You will get the prize immediately after I've announced the winner.
Q: "Can we keep trying if we already answered?"
A: Unfortunately, no you can't. Because that will mean one person will be flooding the thread throughout if guessing multiple times is allowed. I will move on with a new question if no one gets the right answer say in 1-2 days, and price will move forward to the next question. This also gives chances for others on a different timezone to answer. It can prevent one to guess only without having to do "research" or finding the actual info. But by guessing first, you can also stand a chance first that "maybe" you get lucky by answering a question correctly. So it's up to you to decide on your best move for the question.
Q: "And any member can win more than once? I mean, previous winners can still play?"
A: Yes, they can still play of course. It is okay to keep winning prices, no worries ^_^
Q: "What if I've already posted something but only realized later that someone has already posted the same thing as I did? Can I edit or answer again?"
A: Yes, you can answer again if you realize that happens. You can edit your post but I will prefer if you post on a New Post. Please state someone else has posted it already.
Q: "What if someone answered before me but misspell something in the answer, while I spelt it correctly?"
A: If this happens about the same time, I will give the win to the person who spelt it correctly. This is only applicable for very short time frame, say 1-2 minutes. If an obvious spelling error occurred but no one has yet to answer it within that time frame, then I will just give the win to the person who misspelled it, but only if the spelling mistake is obviously accidental.