Tab Name Different than Website Name

Hi everyone, I just wanted to ask how do I change the tab name that shows up to my website name? I must have done this when I first started my website and I can't remember how I did this. How do I change what shows up in the tab?

P.S I blocked out my actual website name because I feel like kyle or carson might see this as just a spam post to get viewers to my website. Or am I just over reacting?