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With your instance types selected, you now need to set the number of instances in your Core and Task Instance groups. Again, if you're just putting up a cluster for learning purposes, you will want to minimize the resources you're using, so change the Core Instance Group's Instance Count from the default setting of 2 to just 1. Leave the same setting for the Task Instance Group at 0, and click Continue.
When you provisioned your AWS account, you should have created at least one EC2 key pair. Pick one for your EMR cluster. Without it, you won't be able to establish a secure terminal session and work interactively with Hadoop. Once you've selected a key pair, click Continue.
You needn't worry about bootstrap actions, so just click Continue through this screen.