Add a title tag to my company's Google search name.

[Kim_Mazzarella]

I need to add a title tag to my company's name when it pops up in Google.  I found a few tutorials but they seem outdated.  I know that I need to go into the theme.liquid and then copy and paste a code to allow me to add the tag.  I found where I think I would copy and paste but it doesn't look exactly like the directions given.  Can someone give me a step by step guide or point me in the right direction of the most up to date tutorial?

[Kim_Mazzarella]

Link I have found but they don't look like my store's code

https://www.templatemonster.com/help/shopify-how-to-change-browser-pages-titles.html?utm_source=yout...