LulU nice to see u are posting here. first of all welcome to best gfx forum lol
now back to the topic:
shaperning tool is at the left on the tool bar. ( Photosop has a tool bar at the left.)
there are tools there. of course there are not letter only images so if you want to know how they;re called then just put the mouse on top of the image and wait till the name comes out.
now if you left click it u use that tool but you can also right click on one of those tools and it will show up other hiden tools. so look for the sharpen tool in one of those tools