Staking cryptocurrency would be a brand new phrase for some people who have not involved in crypto world. In short it similar to traditional banking system, you open saving account then you put money in and you earn interest as a return in every month.
So to stake cryptocurrency you need to hold some coins or tokens in your account first then your earn interest as an amount of coins or tokens back. Keep in mind that only Proof of Stake (POS) coins or tokens are stake-able.
To create an account and stake first your need to consider which coins or tokens you want to stake, go to their website and download their wallet. Second deposit some fund to buy coins or tokens from any crypto exchange site then send it to your wallet address. Lastly turn on staking mode in your wallet you have downloaded.
***NEO is an example as POS currencies that stake-able***
Overall staking cryptocurrency is not that profitable at all unless you spend whole lots of money to hold them and stake. But the good news is it save lots of electric power because you don't any computing power to stake.