How to set the position of a active cell and clear the contents of the cells

Dear all ,

I have 2 questions:

1) How to pre set a position of a active cell after you click a button using VBA

2)How to clear the contents of a range of cells :

e.g:

For i= 1 to 66 ' rows
for j= 8 to 21 ' columns
<coding>
Next
Next

How to clear the words in this range of cells and pre set the positon of the active cell ?

Thanks.