I don't know how to take off the head light lens

The headlight lens is molded as part of the headlight body. You can not just remove the lens.

If you need a new lense, you will have to buy the entire assembly. If you are trying to replace a blown headlight bulb, you can access the bulb from the back of the headlight assembly. Remove the electrical connection to the headlight bulb and remove.

There are various ways that manufacturer secure the headlight bulb in the housing, but I am not familiar enough with this model to give you the step by step.

Probably not a lens cover at all. It's just a 1 piece plastic headlight. It you are wanting to replace a bulb , they go in from the back . Open the hood and you should be able to see where the wires to the bulb go in the back of the headlight.