Declare as Integer
First an observation:
Observing: Declare the Maxrows and Maxcols like Long (Dim Maxrows As Long), because many old tutorials use Integer, which has 2 bytes and
  the range from   -32 768 to 32 767. So if the Excel version is
  longer than 2007, the program will stop after line 32767. Long
  has 4 bytes and a range of -2 147 483 648 to 2 147 486 647. Where the
  Excel has a limit of 1 048 576 lines.
And declaring in the form:
Dim maxRows, maxCols, r, c As Integer
Only c is like Integer, all other variables are Variant.
The right thing would be:
Dim maxRows As Long, maxCols As Long, r As Long, c As Long
Otherwise the code is correct and would work. It works with Selection, then first the desired range must be selected.
Solution
I like to check if the path exists before trying to create the folder, to avoid errors (What already occurs in code with If Len(Dir(ActiveWorkbook.Path & "\" & Rng(r, c), vbDirectory)) = 0 Then).
With ActiveWorkbook.Path & "\" & Rng(r, c) the path of the Excel file directory is being used as reference to create the folders.
It follows the way I use adapted to your code, which does not necessarily need to be in the same folder as the Excel file, but the complete path must be inserted:
Sub MakeFolders()
    Dim Rng As Range
    Dim maxRows As Long, maxCols As Long, r As Long, c As Long
    Set Rng = Selection
    maxRows = Rng.Rows.Count
    maxCols = Rng.Columns.Count
    For c = 1 To maxCols
        r = 1
        Do While r <= maxRows
            CriarCaminho (Rng(r, c))
            r = r + 1
        Loop
    Next c
End Sub
Public Function CriarCaminho(ByVal path As String) As Boolean
    CriarCaminho = True
    Dim fso As Object
    Set fso = CreateObject("Scripting.FileSystemObject")
    If fso.FolderExists(path) Then
        Exit Function
    Else
        On Error GoTo DeadInTheWater
        fso.CreateFolder path
        Exit Function
    End If
DeadInTheWater:
    MsgBox "A folder could not be created for the following path: " & path & ". Check the path name and try again."
    CriarCaminho = False
    Exit Function
End Function
Reference
To use the Scripting.FileSystemObject, the reference shall be added in the VBE.
In Tools -> References...
Add the 'Microsoft Scripting Runtime''

							
							
						 
Thank you so much for the help! For some reason you crashed Excel but it must be hardware kk .
– Christian O. Santos