So I brought a pizza from a local shop and now it’s in the fridge. Can I put it in the microwave? I don’t like it crunchy so...?

Yes, you can microwave it. The crust might get a little chewy and tough, but it sounds like you may prefer it that way. If you have one of the plastic covers, use it because it will hold in the moisture.

So the pizza was already cooked that you bought?  If yes then yes you can put it in the microwave to reheat it.  I hope you bought it recently and it hasn't been sat in the fridge for too long. 

If you bought a frozen or fresh uncooked one then you'll have to refer to the instructions on the label for how to cook it personally I wouldn't recommend cooking it in the microwave.

If you microwave it, the crust becomes tough and rubbery and then hardens when cool.

Ideally, wrap the pizza loosely in foil or place in a foil covered baking pan and reheat in the oven on low heat until warm.