To staking postoken it must be on the postoken website wallet or can be in myetherwallet??
It can be any ethereum wallet that accepts erc-20 tokens standard. But anyway remember that you need to use mint() option - stake manually.
Is there any tutorial how to use mint?? I have 500 postoken in the mew wallet but nothing staking

It's quite straightforward... login to MEW, go in the send tokens menu, set a reasonable min GWEI price on top right (cheap but also safe for the tx to go through), send 0 POS to yourself (your current eth address holding the POS), set gas limit 200'000, send the transaction.
I followed your suggestion but it seems to give me error:
The ERC-20 Token Transfer might have Failed (ErrCode: unable to locate corresponding Transfer event log), check with sender.
Is it normal?
Yup, it is normal, does not affect stacking.
I am newbie.How to use this Signature?Just copy that newbie code on my profile or other work for this Signature Campaign?Anyone help me please.
Airdrop and bounties are over months ago.
does Lending Platform Account also supports the staking power of POS that I deposited there? Thanks you!
Its not supported, once we deposit our postoken its no longer our property and we just need to wait for the daily payout from the lending platform. i am still weighing the profitability of Lending Versus Minting at today's price the minting is much feasible compare to lending.
Yeah, personally I agree with you, as of the moment I will just stay staking it, until such a time that lending will be more profitable, I guess.
Same thoughts. Imo first two years interest rate is 100% and 50% respectively, so I would be doing only stacking for first two years then after I feel that PoS price would be to the moon so then I will try lending.
Just my two PoS 😂