How do I change the webpage name from Cafe Billing System to RichiamoHub in my HTML and PHP web application? [closed]

I have a Database System Created using PHPMYADMIN, HTML, PHP, I cant seem to change the webpage name from Cafe Billing System to RichiamoHub. Can someone help me with it? Here is the google drive link to the zip file

https://drive.google.com/file/d/10xbKrorm1VJKAv_Gkr2_cppOBRNwjtTQ/view?usp=sharing

I tried changing the code but it did not work, So im lost atm.