Ionic and firestore

Hi i am new to ionic.

My Requirement is to edit a document which is in the firestore.Screenshot%20from%202018-04-15%2016-02-18

this is my program screen shot.

if i select ‘Google’ it will navigate to a editable window and do the edit.

i have tried a lot but i couldn’t;

kindly request your help

Here you go

It is about firebase. i am requesting about firestore

Then this will be fine

Thanks for your Help…