Once your coins reach 14 days, they are eligible to stake. When you actually stake depends on everyone else's coin stake weight (and a touch of luck, like in PoW mining).
The 14-28 day range is the window of time for how much more weight you can accumulate against the network -- for getting a bigger weight to be selected for minting. You need a minimum of 14 days to get eligible, then you gain weight against the network until day 28, then you don't gain anymore weight. This is all written out at the tutorial section of our website. It's lengthy, but informative.
Addition: it is possible to stake past day 28 if for some reason you gained all the weight and didn't stake by then. Once you stake, your coins reset to day zero and you have to wait 14 days again.
Thank you for the information. Am tempted to take coin out and get rid of some but at the same time am wanting to keep it for staking and holding for the future. Just wish I had more funds available to move around from other coins and keep orange but in that position right now to rid all coins and buy back later. Sure as hell do not want to do this but will have to see how this week goes. Hate having to sell coins and then buy back later.