Automatic user registeration

Please I used the quick start theme and I keep having unknown users registering.
How can I stop them delete all the default users
Thanks

Hi again,
To add again, am also having automatic subscribers on my newsletter. I cleared it yesterday and its still have over 2000 subscribers.

Thanks!

Hi,

Please disable the registration and then add another verification tool - i.e. recaptcha field, we don't have any influence on the spam user/newsletter subscribers. In the quickstart package there are only several users added (for the activity content) and they may be removed by your WordPress -> Users section.

Hello,
thank you. I will check it out