dns - powershell add user to the domain -

I'm not really familiar with PowerShell and I'm trying to use it to automate some manual work . I was able to work with 'Change name computer' and 'ad computertethdomain' scripts but was stuck in this part below. I have done a lot but I could not understand the scripts that people are posting (such as acronyms [ADSI] OU ... and so on) Here are the steps:

• Login with the administrator account you have added to the domain
• Go to Control Panel - & gt; Click on the user accounts "Manage User Accounts"
• Click "Add" Username: myUserName Domain: MYDOMAIN
• Select "Admin" for Access Level
• Click "End" on the advanced tab of the user account window after clicking
• Uncheck the need for the "Ctrl + Alt + Delete" check box.
• " Advanced "User Management" under the "Advanced" button.
• "Local users And click on the user section under the group "
• Right click on the administrator account and click on" Set password ", set as mypassword
• Double click on the administrator account
• "The password will never end." Only the normal tab should have a check box in the list. "Account is disabled" has been repeatedly checked, uncheck it
• Right click, close all windows, and log off now W Add to start can enter as mydomain.com \ myUserName as your password.

  would appreciate any help first step (username). Thank you very much

  Look at this blog, it should help you