If you want to display information on a personal page located at astronomy.nmsu.edu/username/ you will need to place an index.html file into your respective directory at /home/httpd/html/username/
Basics of a index.html file - https://www.poftut.com/what-is-index-html-how-to-create-and-use-index-html/
Example of a REALLY BASIC index.html file:
<HTML> <HEAD> <TITLE>Your Title Here</TITLE> </HEAD> <BODY BGCOLOR="FFFFFF"> <CENTER><IMG SRC="clouds.jpg" ALIGN="BOTTOM"> </CENTER> <HR> <a href="http://somegreatsite.com">Link Name</a> is a link to another nifty site <H1>This is a Header</H1> <H2>This is a Medium Header</H2> Send me mail at <a href="mailto:support@yourcompany.com"> support@yourcompany.com</a>. <P> This is a new paragraph! <P> <B>This is a new paragraph!</B> <BR> <B><I>This is a new sentence without a paragraph break, in bold italics.</I></B> <HR> <form action="/action_page.php"> <label for="fname">First name:</label><br> <input type="text" id="fname" name="fname" value="John"><br> <label for="lname">Last name:</label><br> <input type="text" id="lname" name="lname" value="Doe"><br><br> <input type="submit" value="Submit"> </form> </BODY> </HTML>