If you have an existing shower, simply unscrew the shower head and install the handheld unit. It should have come with an attachment to cradle the shower head in. If it is an original installation, you haven't provided enough information to give qualified assistance. Good Luck
OOPS. I was just preparing to answer your question when I happened to re-read it. Thank God I did.
I first thought you asked how to hang by a handheld shower ans I was going to say to wrap the flexible piping around your neck and quickly sit down. I'm glad now I didn't say that. Mounting instructions and hardware should have come with your purchase. read it and do as it says.
you will need to drill into the tile to install it , you will need a masonry bit , and align it with a grout line ( as this is much easier than trying to drill into the center of a tile , mark with a pencil ( easy on a grout line ) and drill holes to fit the plastic anchors provided with the unit . if not buy some stainless steel screws and matching plastic anchors and matching drill bit size at home depot or Lowe's other than that a local handy man would love a lil job like this ~!