Question   How do I unlock the admin's account if it was locked from failed login attempts?

A. Go to the member list page in the members area - next to the member you want to reset his login you will find "view" - click on view a popup window will show up, you will see in it something called "failed logins" and next to it a link "Reset", click on it , it will reset the failed logins to 0

A. Yes, go to "Advanced Features" and click the "Misc" tab

and towards the bottom you will see "Login Redirect URL". 

Change this to the url of the page you want a person sent to once they login.  Often the easiest approach is to create a resource page with the content you want a person to see when they login, and then set the "Login Redirect URL" to the resource page.

A. You should setup a separate account for you to use.  The admin account has several cases where it operates differently and is best not to use as a personal account.

A. If admin access is set to yes, then members belonging to that membership are able to access all pages that an admin can access.

A. Yes, go to "View Members" and click the "view" buton next to the Member and there is a section at the bottom of the popup that will appear showing the login history.