PoS is very easy to understand, you just buy coins, in this case that will be Solaris. Once you bought them, have them sent to your local wallet and wait for them to mature, not sure how long they will take to mature but most PoS coins take average 8 hours. Once they are mature, they will then start to stake and you will get a reward for each stake in the form of more Solaris coins. Leave the wallet open for as long as you can so you have the best chance at earning stakes. I would say a minimum of 12 hours at least to leave the wallet open. It will be interesting to see how PoS will work here and how many people will be staking. I hope this helps you out a little on PoS and what its all about.