How and where to create a user account for starting to work with SQL2012?

I am quite new in SQL, and trying to install the SQL2012 software, downloaded from the Microsoft website, to my PC
Installing works fine, until at some stage it requires a user account, then the error message appears "The credentials you provided for the SQL Server Agent service are invalid. To continue, provide a valid account and password for the SQL Server Agent service".
Where and how do I have to make that account ? If I follow the instructions below (appendix), I do not find Local User on my PC, so I can not add a new user as instructed. How to solve this, do I need additional software installed on my PC ? (also my Microsoft Azure cloud server logonid does not give the solution)
Thanks very much for your help in advance, Jan vd Wind

Prior to installing SQL Server, you need to create a user account that you will later use as the service account for SQL Server services.
To create a user account Right-click Computer and choose Manage to open the Computer Management snap-in. Navigate to Computer Management (Local) | System Tools | Local Users and Groups | Users.
Right-click the Users folder and choose New User.
Fill in the details for the new user account in the New User dialog box, as shown in Figure A-1.

Ben-Gan, Itzik (2012-07-15). Microsoft SQL Server 2012 T-SQL Fundamentals (Developer Reference) (Kindle Locations 10138-10144). Pearson Education. Kindle Edition.

Please cloose this question. I found out that the password of the new domain was not set, and that is a must, must meet difficult password requirments. manual on microsoft itself.

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