There are some suggestion for this item, please install as below:
This item contains front and back cases which should be used at the same time. That means you cannot just use the front or the back one.
Put the back case on your iphone and then fix the front one, moreover, you have to make sure that the back case is totally covered by the front case. Adjust the front case and back case together seamlessly, your iphone would be protected sturdily and steadily.

• Unique design with Front and Back 2 cases, 360 Degree full body protects mobile phone from scratch, drop and shockproof
• Quality non-toxic soft TPU material which is more flexible and durable
• The cases are transparent that all ports, screen are easily accessible and the camera, speaker and buttons can work as usual. The case has dots or grid on it that is one of the design parts, so do not worry about the quality issue
• Installation method: This item contains front and back cases which should be used at the same time. That means you cannot just use the front or the back one. Then put the back case on your cell phone and then the front one, make sure that the back case is totally covered by the front case. Finally, your cell phone would be protected sturdily and steadily
• You can use this item with a temper glass screen protector and it may affect a little bit but not too much. If you extremely concern about the touch sensitivity, please do not put on the temper glass screen protector, because this item can protect your cell phone sturdily without the temper glass screen protector

Unique design with Front and Back 2 cases, 360 Degree full body protects mobile phone from scratch, drop and shockproofEasyscooter