VBA to Autofill on Filtered Columns only

Hi, I'm trying to create macros to analyze my research project data.
I'm new to VBA and don't know much so I try to record macros if it works and then get the base code and tweak it.

I have filtered my column B ("animal") to show only "z011" and "z012". I assigned the value "Control" in "C12" (First cell in this case). I need to assign these filtered rows as "Control" in Column C from the first cell ("C12" in this case), till the last cell.

This is my code currently that i managed to work out from various threads here and there. However I'm not sure what's wrong as it changes my entire sheet cells to "Control".

Please Login or Register  to view this content.