You pick the players, it gives you the best lineup. Only problem is that you have to select nine players, and pitchers aren't included, so it's making you pick a DH. That said, here is the lineup it generated for me:

1 Freel
2 Larue
3 Griffey
4 Dunn
5 Lopez
6 Kearns
7 Aurilia
8 Hatteberg
9 Womack

It says that this lineup will have a RC/27 of 5.6