Get a register page - User seach for it there is plenty out there
then get a webserver ( xampp, wamp, etc)
Inside the webserver find a folder named www put the regiter page you got in there.
Remember you have to config it to access ur database.
Once you config it and everything make sure you dont have a firewall blocking it and your port 80 is open.
Once that is all done go into ur internet explore or whatever you are using and type in address bar localhost and see if you can view your register page
If you cant you did something wrong if you can you did it right.
For other to see it just give them the link to it. If you dont have dns it will be a IP address like

or something like that