This is the same process as changing the company name, or any other content in the text.html or text.txt file. To do so please do the following:

1) So first of all you need to open text.html or text.txt file in Notepad and search for the button names, that are ("menu2, menu3, menu4, menu4, and replace the text, which has yellow background with your own content.

3) Then, you need to save the text.txt or text.html file and upload the file to your web server.

NOTICE! :
you can only changed text, which are highlighted or any other changes will cause problems when loading or reading the text.txt file. DO NOT ENTER ANY INFO OUTSIDE THE YELLOW TEXT.