How to repeat formula without changing table array

Hi. How does on repeat this formula down a column, without changing the table array numbers?

I want this:
=VLOOKUP(A2,C2:D100,2,FALSE)
=VLOOKUP(A3,C2:D100,2,FALSE)
=VLOOKUP(A4,C2:D100,2,FALSE)
=VLOOKUP(A5,C2:D100,2,FALSE)

But right now I end up with this:
=VLOOKUP(A2,C2:D100,2,FALSE)
=VLOOKUP(A3,C3:D101,2,FALSE)
=VLOOKUP(A4,C4:D102,2,FALSE)
=VLOOKUP(A5,C5:D103,2,FALSE)

=vlookup($a2,$c$2:$d$100,2,false)