@Members_aDsAj40: To edit a contact, please open the Contacts app, select a contact, then tap the pencil symbol at the bottom of the screen. Tap the drop down arrow to the right of the contacts name, tap on the relevant field e.g. First name, then hit Save at the bottom of the screen when you've made the necessary changes.
Head back to the Contacts app landing page > Tap the 3 lines in the top left > Tap the cog symbol in the top right of the pop up window > Sort contacts by > First name or Last name > Name format > First, last or Last, first.
I hope this helps.
