Changing words on my website whilesomeone is logged in : <p>How can I set words on a page, in my case the words: "sign up/login" change to "profile" when someone is logged in on my site?</p>

<p>I also want to add words that say, "welcome (profile name)</p>

<p>(Website is in html5 and the page has a .php extension, on windows 10 if that helps) </p>
