Floating shelves appear to not have any hardware holding them in place on the wall--they seem to just be floating in place. But, of course, there is hardware holding them firmly to the wall. The easiest way to attach a floating shelf to a wall is to use a wall bracket that hides directly behind the shelf and locks into the back of the shelf. You will need to follow a few specific instructions to be sure your shelf is anchored securely to the wall.
Locate the studs in the wall where you would like to hang the floating shelf kit. Hover a stud finder over the wall, which will let you know when it comes to a stud (with a light a noise or some other indication, depending on the type). You can also look for the small nail holes in molding along the wall, which are anchored into the studs. Make a small mark with a pencil over the stud at the level you want to install the shelf.
Hold the bracket up to the wall where you will hang the shelf and place a level on top of it. Adjust it until the two bubbles are between the lines in the tubes, which will indicate that the bracket is level. Use your pencil to make a mark in the screw holes in the bracket.
Drill pilot holes where the marks are, and be sure to use a bit that is slightly smaller than the width of the screws with which you will be mounting the bracket.
Place the bracket against the wall and line up the screw holes with the pilot holes. Attach the screws with your screwdriver, or with the appropriate drill bit attached to your drill. The bracket should be anchored securely into the wall.
Erase the pencil marks on the wall. Line the bracket up with the shelf so that they lock together. You can now display things on your sleek, stylish floating shelf.