Excel VBA add a value to column : im really new in excel vba programming and i have got a question.

I've got a excel table that looks like this:

t t1 t2 

1 4 5  

2 3 6

3 5 8

How can i skip the first row with the header (t,t1,t2) and then add the number 3 to the values in every row?

Thank you for your help!