Select Carry out conversion via event. Select the conversion identifier that you found in step 2 as the event. Only Leads that convert after the workflow is activated will join the workflow. If you want to include Leads that converted prior to workflow activation, you will have to check the option Include Leads that meet these criteria, but have never gone through this workflow.
In the Actions tab, drag the Send Email action into the workflow and select the name of the email you want to send;
If you want to add more emails, drag the Wait action into the workflow and select how long to wait before the Lead receives their next email.