Return Row Number?

To wrap code use / symbol not \

Also No need to select

Try

Sub findRowNumber()
Dim Rng As Range
    
Set Rng = ActiveSheet.UsedRange.Find(What:="104", After:=ActiveCell, LookIn:=xlValues, LookAt:= _
        xlPart, SearchOrder:=xlByRows, SearchDirection:=xlNext)
        
MsgBox (" The Row number of the selected cell is " & Rng.Row)
    
        
End Sub

VBA Noob