Including Column A String Into Input Box

I have a code of;

Private Sub Worksheet_SelectionChange(ByVal Target As Range)
Set Target = Me.Range("c4:f100")
Dim iSold As Long, iColumn As Integer
Dim strTitle As String
If Intersect(ActiveCell, Target) Is Nothing Then Exit Sub
iColumn = ActiveCell.Column
Select Case iColumn
Case 3

An what i need to happen id the input box saying "Please enter quantity of (whatever is in cell A11) assuming i am clicking on E11

so in other words, in cell A11 it says "MONITOR", i need the input box to pop up and say "Please enter quantity of MONITOR "