I need help moving to a multisite

I am wanting to make my WP a multisite. I have your documentation

But as Bluehost where I have my sites offer now help in the area of multisite, I just need to get past the first step! What I dont know how to do is:
"Open your wp-config.php file which you’ll find in the folder where you installed WordPress. Find the line that reads:
/* That's all, stop editing! Happy blogging. */"

Can anyone on your end help me do this?