another quick and possibly noob question. uptime means letting your wallet be online (meaning to say that computer has to be on) and for balance rating and POS, it can happen by just opening your wallet sometimes? thanks in advance!
You can mine PoS blocks the traditional way by running your client from time to time and earn the standard 20%.
If you decide to run a node, you would earn 20% + the bonus for running a node, depending on your balance + uptime.