To fix this headache, it is very difficult even for repair stores. Refer to iFixit guide, Samsung Galaxy S7 edge Repairability Score is 3 out of 10 (10 is easiest to repair). Because the S7 edge phone and screen use tons of adhesive to attach the screen, glass lens and the frame, meaning when anyone breaks one of them all three need to be replaced. Replacing the glass only is a big challenge even for professionals.
There are plenty of in-depth tutorials about changing your Galaxy S7 screen on YouTube. You should start with REWA's video where they provide repairs the screen guide and Samsung phone repair parts.
Samsung s7 edge screen repair Detail steps:
Cracked Screen Testing

Make sure the display and touch functions both work well on the glass-cracked screen.
Frame Separating

Firstly, we need to remove the screen from the middle frame of the phone. Use Pry Piece, 530 cleaner and Heat Platform to separate the LCD and frame preliminarily, then separate it completely with Frame Separator.
OLED Separating

Samsung SuperAMOLED screen separating is different from iPhone screen repair, here we use Frozen Separator to disable the glue and a plastic Pry Piece to help.
Put screen into Frozen Separator, freezing 30s, then separate the OLED from the glass.
Glue Removing

With the help of 8333 removers and N-hexane, clean the glue residue on the OLED.
OCA Laminating

Use a Manual OCA Film Laminating Roller to laminate OCA sheet onto OLED.
Bubble Removing

Put it into Bubble Removing Machine for 15 minutes. Make sure the OCA is bubble free on OLED.
Glass Laminating

Align the front glass with OLED, then laminate the glass and OLED with help of Vacuum Glass Laminating Machine.
Bubble Removing

Put it into Bubble Removing Machine again for 15 minutes. Make it bubble free after glass laminated.
Repaired Screen Testing

Make a complete test of the repaired screen display performance, touch functions, all testings are good.