As mentioned above, also make sure you add only very little at a time or you can easily overfill, literally a shot glass amount of fluid was needed to get it from not showing on the dipstick to reaching the max cold reading. Though a small turkey baster should fix it should you overfill.

If you didn't know already, there is two ways to check the PS fluid level, either HOT or COLD based on the dip stick. Which has two hatches (min and max) for both cold & hot readings. Make sure you push in the dipstick/cap all the way in and screw it down before pulling it back out to get a proper reading on the level.