Good morning pinkpearl8130
...and welcome to the forum!!
If you want to you a dropdown type box, the easiest way is to use Data > Validation, select list from the Allow settings and then select the range you'd like to use. You then need to use VLOOKUP formulae to pull the correct address from a predefined list.
All that probably sounds a bit too confusing, so here's a simple example to pick apart and see how it hangs together.
HTH
DominicB
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