Does anyone know how to do code so you have to enter a password to enter a website??

you can use a java script password.... but if they disable javascirpt then they can get it...

does your host have cpanel? you can use that to password stuff in the options of the directories iirc

use a .htacess file. Google

check this: http://javascript.internet.com/passwords/login-coder.html
if you want something more professional check this : http://www.cgiextremes.com/extras/Tips_Tutorials/htaccess.html (like chestah said)

NEVER EVER use javascript for password protecting a webpage. The js code is run on the clients side, meaning all the code is sent to the user before its executed.
This means that they will easyly be able to see what the password is.

Either use .htaccess or php

.htaccess is the easiest way. And it is sercure.
http://www.javascriptkit.com/howto/htaccess3.shtml