I have a question about green kappa.
it states the when the card is flipped face up destroy 2 spell or trap cards.
My question is, what if there are not 2 magic or trap cards on the field do i not get the effect?

Respond as soon as possible

That is correct, the effect would disappear if there is only one face-down spell or trap on the field.

Yes, there must be AT LEAST 2 face-down Magic/Trap Cards on the field (can be on just 1 side of 1 on each side or something).

If there is just 1, the effect will not resolve properly, but if there are 2 and you select them and one gets chained to its activation, then it still resolves and destroys the other selected m/t.


Rulings
If there is only 1 face-down Spell or Trap Card on the field when the effect of "Greenkappa" is activated, the effect disappears.

You can chain to the effect of "Greenkappa", even with the targeted Spell or Trap Cards. If only 1 of the 2 cards is chained, "Greenkappa" will still resolve and destroy the other. If "Greenkappa" is destroyed in a chain to its effect (such as with "Torrential Tribute") its effect still resolves.

Since "Greenkappa" targets, you can use "Fake Trap" to save your Trap Card(s) that were targeted by "Greenkappa".