Registering

CCleaner for Mac
1

I just bought CCleaner and installed it. It says my application is still unregistered, where do I go to register my application?

2

See here if any of this helps (it's for Windows but hopefully it's the same for Mac users) - i.e.; it's two posts one by Sandra CCleaner and Dave CCleaner:

https://community.ccleaner.com/topic/56722-ccleaner-registration/?do=findComment&comment=314922

3

Do you mean that you can't enter the CCleaner licence key into CCleaner itself?

Or do you mean that your Mac computer is telling you that the app is unregistered? 

If it's the computer saying this then where did you buy CCleaner from?