Anyone can join Bitminter instantly. Theres no requirement you can join with 1mh/s too. Go to bitminter.com, select log in and choose your preferred login method. Next create a user account and click the engine start and wait for it to download. Make sure you downloaded java. It will prompt you to run it. Tick the box and run it. If you do not see your ASIC miner, look up the url to download the drivers. Next, install driver. Once finish installing, you must click the play button near the asic and fill in your account details. Happy mining!
Edit: Drivers are needed if you have a ASIC miner.