The batch window will pop up. Pick the set and action you wish to use, then make sure the source and destination folders are correct. I use folders named "for batching" and "batched". If you use the same folder, the images will be over-written. Once you click "OK", Photoshop will automatically apply all the steps you recorded to each image in the folder you specify as the folder to be batched. You can actually watch it launch and edit each image individually.