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Wearing safety glasses and a dust mask, use a drill with a mixer bit to mix grout according to the manufacturer's instructions. Use the type of grout recommended for the tile. Pre-mixed grout is also available, but is more appropriate for smaller jobs.
Remove any tile spacers from between the tiles before starting to grout. Make sure the area is clean and free of debris, and that the tile adhesive has cured for the correct length of time.
Starting in one corner, spread grout on the floor with a grout float held at a 45-degree angle. Work the grout well into the joints between the tiles.
Let the grout cure according to the manufacturer's instructions, then seal it with a recommended grout sealer for easier maintenance.