This screen allows you to change your password.  Because in the screen shot below I am logged in as an Administrator I have options "normal" users would not have.  You do not need to do anything on this screen other than, if you like, Change Your Password.  I think this is a good idea and recommend it.  However, first you may want to create another user account for yourself and Link it to the Administrator role.

When you click the Change My Password button, you will see a screen like below.  Because when you first install the program the Admin password is blank or empty, skip the "Old Password" field and type what you want for your new password in the 2nd and 3rd boxes (entries must match) and click OK.  The next time you start the program you will need to use this new password.