How do I join the Crusade

[Ilovestar]

So the pope just asked me to create a crusade army to join the crusade. And I got 9 turns to do it. I got plenty of forces, how do I join the crusade? I cant find it.

[Lusted]

Click on army, bring up the details scroll for it and there is a button near the bottom with a cross on it that makes the amry into a crusading army.

[peer]

At the bottom of a General's info scroll there's a "Join Crusade" button. He needs at least eight units in his army to be eligible.