Users with Personal roles can create plays by selecting the Playbook from the left navigation, then by selecting the '+' on the top right of the Plays list.
Leadership and Department role users can create a play by selecting the Playbook from the left navigation, then by selecting the Department name where you would like to add a Play.
Once in the Department Play section, select the '+' on the top right of the Play list.
In each case, you will be brought to the same Play template where you only need to name the play and assign an Owner to get started. You can then begin to populate the other fields and using the pencil icon towards the bottom, start to outline the individual steps in your play process.