Remove the tile if most of it has become unattached from the floor. Insert a floor scraper under the tile and use firm pressure to pry up the tile without breaking it. If most of the tile is still attached or the tile won't come up easily, leave it alone to avoid breakage. In this case, you will need to use an injectable adhesive. For instructions on injectable adhesive, see Step 4.
Clean the area under the raised tile with a vacuum cleaner or sweep the area clean.
Apply adhesive remover to the back of the raised tile to remove the original glue. The new adhesive will stick better if the old dried adhesive is removed.
Apply parquet adhesive to the floor, according to the manufacturer's directions. In general, the adhesive should be applied to the floor with a notched trowel. If using injectable adhesive, follow the instructions in the kit. In most cases, the adhesive is prepared and then placed into a plunger. The glue is then released through small drilled holes in the loose tiles.
Reset the tile on the floor. Clean up any adhesive on the surface with a damp rag. Weigh down the tile with a full paint can or heavy books.
Allow the adhesive to dry, according to the instructions on the label. Drying time is usually about two hours.
Fill in small gaps around the repair with a filler stick from a touch-up kit, if desired.