Can someone explain me please where I have to stake 5k coins to get the card and how do I claim it after I put the coins on staking?
In your TUBE wallet.
You will be able to register for the card at block height 140k, which is in about 10 days (countdown:
http://counter.tubeapps.io/countdown/index.php ). It will be probably explained better by then.
They will be issuing the cards in Q4 of this year.
You will not be able to use the 5000 tubes, unless you cancel the card, or they change the stak amount, because of the price.