If you use a form, and use the GET method, it will send the form's data to the page.
Like so:
PHP Code:
<form action="newpage.html" method="get">
<input type="text" name="textField1"/>
<input type="submit" value="Submit Text"/>
</form>
Submitting this form will send you to the page newpage.html?textField1=[value you entered]
The 'name' attribute in the text field is what the name of the appended variable will be.
Hope this helps.
However, if you wanted to append the text in a different way, you would need to use some basic javascript.
W3schools has some nice tutorials for javascript and HTML, I highly suggest reading through them.
http://www.w3schools.com/html/default.asp
http://www.w3schools.com/js/default.asp