execute an Add In

Hi - there folks.

I went to the addin folder and inserted

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

in This Workbook

Saved and closed, but the only way i can get it to work is by Developer tab > Visual Basic > hitting the execute button.

I was under the impression that i could run an add in from the add in box by checking it and pressin ok???

Anyone know what i'm doing wrong???

cheers