I want to use my own buttons for calendar, chat etc. how do I edit the code so that when someone click on my buttons they are taken to the relevant pages

Thanks for your help

Browser: firefox

You need an understanding of the basics of html.

99.9% of all editors have a function then lets you edit the native html. What that looks like depends on the program that you are using. Either read the vendor help file or give us some more details.