To alter website title, go to your site Cpanel then go into File Manager and click on the file named index.html. Mark this file and on the top you will see a button named "Edit". You will now find yourself in the source of the index.html file. The following code should be found by you in the top of the file <title> and </title>, as you see below:
<title> write here what you like </title>
After writing your title in it save it and refresh the browser and you will see the change.
Go and see: VIDEO TUTORIAL HOW TO CHANGE TITLE OF YOUR SITE