After buying a paid copy of the software, the next step is to register the copy on your machine so that you can make full use of all available features. 
The Machine Number: This is an identification number which is unique to every machine on which the software runs.

Step1: Enter your E-mail Address 
Step2: Click on "Get Password" 

The password will me emailed to you. 

Step3: Once you receive the password, enter it in :"Enter your Password Below" 

Step4: Click on "Unlock" to access the complete version of the software. 

Close the program and restart it. When started again, the registered copy of the software is accessible.
The Buy option is also available in the start of the program.