execute an Add In

Hi Guys.

I have tried to create an add in >

Open Workbook > Developer > Visual Basic >

Sub move()
Columns("A:Z").SpecialCells(xlCellTypeBlanks).Delete Shift:=xlToLeft
End Sub

Save as addin in Addins folder

I located in and ticked it in addins available

I then opened the book which I wanted to run it on and zip, zero nada! do i need some sort of execute code?

Thanks alot for looking