Macro "Run" greyed out

I have a simple Macro but when I select it the run function is greyed out? I am not a programmer and just trying to understand Macros. Help!

Where did your “simple macro” come from?
Is your document write-protected?
Where is the “macro” located (‘My Macros’ of LibO or document?)
What’s your setting undr ‘Macro security’?

(Running a macro won’t halp much to understand macros.)