For Wanchain staker, you go to the official Wanchain website and click on "Get started".
Then you choose the version of your wallet, if you want the mobile or pc version. Personally I use the mobile version.
Then you create your wallet, you create a pin code, you write down the passphrase, you arrive on an interface as if below, you click on POS.
Then you choose your validator, once the validator chooses, you click on it.
Then you arrive on the page as if below, you select the amount you want to staker.
Once the amount has been selected, you click on "send" and on "delegate", and voila, it's good.