How can I change front glass

@himanshura65766 a glass only repair for this display is difficult. You will need some pretty good tools to get this successfully accomplished. It is also fairly difficult to fit it back together if you have never done a glass only repair. It will cost you more to purchase the tools and consumables, to do a glass only repair, then it would cost you to replace the complete display. I would suggest you replace the display.

Since iFixit does not yet have a specific guides for this repair, use something like this video You do not need a hotplate for this. You can use a quality hairdryer as well as a hot air gun. Do not go above the usual temperatures for this at between 80 and 100 degrees Celsius with 80 degree Celsius being standard. To hot, and your LCD will get damaged. Replacement screens are readily available at many online stores.

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!