The third step is to create the key poses for each phase of the walk cycle. You can start by setting the first contact pose, where the character's leading foot is flat on the ground and the trailing foot is lifted behind. Then, you can copy and paste this pose to the opposite side, where the leading and trailing feet are switched. This will create the second contact pose. Next, you can create the down pose, where the character's body is lower and the leading knee is bent. Then, you can copy and paste this pose to the opposite side as well. After that, you can create the passing pose, where the character's body is higher and the trailing foot is in front of the leading foot. Again, you can copy and paste this pose to the opposite side. Finally, you can create the up pose, where the character's body is at its highest point and the trailing foot is about to touch the ground. You can copy and paste this pose to the opposite side too. You should have eight key poses in total, four for each leg.