This example reads every character in a string from left to right and returns the result in a message box. It makes use of the Mid function.
Sub LoopThroughString()
Dim LookInHere As String
Dim Counter As Integer
'Use your own text here
LookInHere = "AutomateExcel.com"
For Counter = 1 To Len(LookInHere)
MsgBox Mid(LookInHere, Counter, 1)
Next
End Sub