How do i find and delete the hidden .trashes folder on my sd card?

I just recently bought a new canon 600d camera and i also bought a new 16gb sd card for it.

I use this camera for videos mostly.

My card seems to fill up incredibly quickly and when i empty it, it stills says about 600mb is taken up. I looked it up and apparently its because of a hidden folder called .trashes? I cant figure out how to find this folder or how to delete it.

Ive seen a few people say you can find it somehow using finder, but my issue is that my camera doesnt show up in the finder, a program called image capture comes up and i can import all my videos from there perfectly fine.

this problem is really annoying me because even when my sd card says its 849mb full, after recording two or three clips, my camera stops recording automatically due to the card being almost full even though its nowhere near full and i have 14.9 gb left?

Im really confused and i just need some guidance on how to go about finding this .trashes file and deleting it.

As you can tell im not too great with technology so any help would be appreciated, thanks.

apologies if this question isnt in the right place, ive never really used this before.