HELP!! need to move entire row from one sheet to another once a specific column is filled

Do you manually enter the "y" into Column K?

Is that going to be the only value in the whole of Column K? Nothing higher up or lower down?

I assume that the "k" will be in the same row that needs to be transferred.

When you say "entire row", why not just the used cells in that row?

The reason I say this is to get you used to NOT use entire rows and/or columns as this will bloat your file size when using it with formats etc.

Attach an example workbook

Copy and paste this macro into the worksheet code module. Do the following: right click the tab name for your 'processing' sheet and click 'View Code'. Paste the macro into the empty code window that opens up. Close the code window to return to your sheet. Make an entry in column K and press the RETURN key or TAB key.

Private Sub Worksheet_Change(ByVal Target As Range)
    If Intersect(Target, Range("K:K")) Is Nothing Then Exit Sub
    If Target.Count > 1 Then Exit Sub
    Application.ScreenUpdating = False
    Application.EnableEvents = False
    If Target = "y" Then
        With Sheets("closed")
            Target.EntireRow.Copy .Cells(.Rows.Count, "A").End(xlUp).Offset(1)
        End With
    End If
    Target.EntireRow.Delete
    Application.EnableEvents = True
    Application.ScreenUpdating = True
End Sub