Hi HarHar,
Here are the steps to send an email when the "Identify Decision Maker" is completed:
1. Go to Power Apps home page: https://make.preview.powerapps.com/
2. Select Lead in Tables
3. Click Forms, select lead main form

4. Add Decision Marker? in the main form.

5. Save and publish.
6. When the "Identify Decision Maker" is completed, the value of Decision Maker will change to completed.

7. Select Advanced settings under gear of Power Apps home page.

8. Expand Settings, select Processes under Process Center

9. Select New and fill out the Process.

10. Convert to a real-time workflow.

11. Select "Scope", click Start when Record fields change.


12. Add steps like:

You can click "Set Properties" to set email.

13. Save and activate.
If you have any questions, you can also reply to let us know. Thank you!
Best Regards,
Sayen Zhang
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