Fingerprint option not ther

@fikirchalachew first check to see if there is a software update for your phone. Install any updates. If there is not, then it is possible that your phone does not give you the biometric option due to a failed fingerprint sensor.

Since iFixit does not yet have a guide for this, use something like this video to change it. Replacement scanners are 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 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.