5/. Open the Timeline and in the centre of the timeline select Create Frame Animation.
Then click on Create Frame Animation.
The Timeline will show your first image.
Then click on the Timeline lined box:
The menu will open up as below:
Select Make Frames from Layers.
All your images will now appear in the timeline:
Now select/change once to forever or how many times you want it to run,
Now to change the animation transition speed to how many seconds you want it to pause. In this example it has been set to 2 seconds.
Click on the play icon and watch your animation run. If necessary change the speed of the animation transitions.