How to create an wordpress multisite for latest ubuntu 16.4 one click install wordpress app there are resources but that doesn't helping me

For example my domain so.com I need an multisite so.com/blog like wise I had been trying the resources that already present but I think those all are for manual installation that means previously there is no one click installation for them it helps could any one please help me out firstly I had created an wordpress website it is running now after finding resources I tried for multisite I had created a new user on that same droplet and installed lamp and while wp configuration problem exists there is no code to place in front of the file wp-config.php file