This process is similar to that of changing the company name, or the other content in text.html file. For this please do the following:
1) Open text.html in Notepad, find the current names of button, specifically ("menu2, menu3, menu4, menu4, and change the text with the yellow background with your own contents.

3) Save the text.html file and upload the text.html file to your web-server.

NOTE!
Please, take into account that you can only modify the highlighted text, any other changes will create problems when loading/reading the text.html file, to avoid that only change the highlighted text, and do not enter any modifications outside of the yellow text.