Search for jivrus mail director
Directly reach the add-on using this link in GSuite Marketplace
Gmail Director at GSuite Marketplace
The Mail Director appear on the add-ons when the G-mail opened
The popup box will open
The google sign in popup will appear
The permission required window will open
Click allow on it
Click on done
Now you can use mail direct add-on when you open your gmail
In order to start Mail Director in Gmail
You can use Mail Director add-on on Mobile
open the Gmail app on you mobile
Open the mail
Scroll down at the bottom of the mail
In "available add-ons" click on Mail Director add-on logo and use it