My phone display was crack how to change or fix it?

@superamoeld since iFixit does not yet have a guide for that, use something like this video to work on it. Replacement displays are readily available at plenty of online stores. Just make sure you get one for your exact version.

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 the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.