Search engines… do a google for free search engines or check with your web host. They usually have a preinstalled search engine. Search engines aren’t really a DW function. They’re a program installed on the server. Whatever program you find and use will give you a line of code to put into your web page. Check with google and other search engines too. They may have a free engine you can configure on your site.
Login is even tougher. Depends on what you’re looking for. If you just want to password protect your site or a directory, look into .htaccess. It’s a file called “.htaccess” that is installed in the directory on the server. You have to edit it and configure it to make the folder password protected. The browser will do the rest and ask for a login and password. Once again, not a DW thing.