"SetFocus" is not a Method of Worksheet, Range, Cell objects. You want to use either the "Select" or "Activate" Method.
SetFocus is only used with UserForm Objects.
Range("A10").Activate
Worksheets("Sheet1").Select
Worksheets("Sheet1").Range("A10").Select
Range("A10").Offset(0,3).Select
Do you know you can put your cursor on the word "Range" in the VB Editor and press the F1 Key to open MS Help to list all the events and Methods?
From Excel Help:
To select a cell or a range of cells, use the Select method. To make a single cell the active cell, use the Activate method.
Example
This example selects cells A1:B3 on Sheet1.
Worksheets("Sheet1").Activate
Range("A1:B3").Select