Router change password

I need to change the username and password for my home router. I need assistance. I know i have to go into the app
Wifi-View Equipment -Advanced settings - Gateway Tool Admin - Allow access

Then I have to go on my browser to hrrp://10.0.0.1 and place in username and password. I am on my phone and i have safari and google. I am unable to get to this step. Do I have to be in my home in order to do this?