No your logged in all the time
Ok google gransnet ( just for this first time) when it brings up gransnet click onto it at the bottom of the screen are some icons ....a square with a cross at the top, a book, and two pages you need to click on the first one the square that will bring up another screen with another variety of icons a star, a book, glasses , and a square with a cross that says add to home page click on that which will put an icon for GN on your home page then every time you open your phone click on that and it takes you straight to GN
Hope that understandable