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You should use the resistance section of the meter and put it across the diode, one way will be infinite, the other will show a few hundred ohms, depending on the type. Most meters have a selection at the bottom of the resistance scale, with a diode symbol next to it. This is usually the one that beeps when you short circuit (<100Ohms), but basically if your meter doesn't have that, use the 2k range.
Zener diodes have a special properties, which is why they are used in power supplies, they leak current when the reverse voltage is over the specified value, in order to keep the voltage at that value. So, if you replace your 6.2v zener with an 8v zener, you'll get 8v probably where you don't want it.
BTW - Without lifting one leg of the component under test, it's not guaranteed you'll determine that it's faulty. For diodes its usually not a problem, shorts are easy to spot, open (both directions) are easy to spot. but there could be a cap in parallel which could create the short condition, for example.