Do I have to link my android app wallet to this account?

Using Android on Blackberry, registered wallet. Then registered here. Is there a need to link accounts?

Is there any wallets in this login?

Would you like to know whether should be linked to your wallet?

No, this website is completely independent of your wallet(s). You don’t even need to have a wallet to ask/answer questions.

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Great thanks. Can you earn rewards here?

You can earn “badges” as on any Discourse/Q&A website. But these badges are just for fun and do not have any monetary value.