Step 1.
Go to the 'Add' button in the navigation bar.

Step 2.
Select 'Add Appointment' from the menu.

Step 3.
Type the name of the lead you want to add the appointment to. Select the lead's name and you'll be taken to their lead page.
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Step 4.
Select the treatment in question in the 'Treatments' section. Click 'Add appointment'.
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Step 5.
Complete the appointment details and select 'Next'.

Step 6.
Confirm the automations you'd like the lead to receive. 

Step 7.
Click 'Done'.