2StepAuth increases security of WordPress blogs by adding 2nd level of Authentication. Keeps your blog secure from hackers.
2StepAuth adds second level of Authentication (a.k.a 2nd layer of security) which helps in preventing unauthorized access to your blog Admin panel. The hacker, inorder to gain access to your blog admin panel, has to complete 2nd level of Authentication by using one of the 3 methods: SMS Verification, Email Verification or Backup codes. Thus, even if your password is compromised, the WordPress blog is safe.
If you dont have TextMagic or SMSGlobal account, SMS Verification feature won't be enabled. The plugin will work with Backup Codes and Email Verification feature.
2StepAuth depends mainly on completion of Step 3. So, you have to complete Step 3 for working of 2StepAuth.
You can skip it and proceed to Step 3. Make sure you generate and save Backup Codes from Step 3.
2StepAuth supports users with 'Administrator' privilege. Other users won't feel the presence of 2StepAuth and they will be redirected to Dashboard on correct login.
Yes, 2StepAuth recognizes different Administrators and supports blogs with multiple Admins.