You can use the Cells property to refer to a single cell by using row and column index numbers. This property returns a Range object that represents a single cell. In the following example, Cells(6,1) returns cell A6 on Sheet1. The Value property is then set to 10.
Worksheets("Sheet1").Cells(6, 1).Value = 10
The Cells property works well for looping through a range of cells, because you can substitute variables for the index numbers, as shown in the following example.
Dim Counter As Integer
For Counter = 1 To 20
Worksheets("Sheet1").Cells(Counter, 3).Value = Counter