Setting size of images (pixels)

I’m trying to alter the size of my tiles, but am having trouble. The images starts at 16x16px, but I need these to be at least twice as big (These images are in tilemaps, if that helps.). When I click on the image the inspector looks like this:


Any way to make these bigger would be awesome. These images are also part of a precut sprite sheet.

you have to click on the sprite sheet from your project folder and change the pixels per unit. A smaller number increases the sprites’ size in the scene…