Find the flow’s unique name.
From Setup, enter Flows in the Quick Find box, then select Flows.
Click the name of the flow.
Copy the unique name of the flow.
From Setup, enter Visualforce Pages in the Quick Find box, then select Visualforce Pages.
Define a new Visualforce page, or open an existing one.
Add the <flow:interview> component somewhere between the <apex:page> tags.
Set the name attribute to the unique name of the flow.
For example:
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</apex:page>
<flow:interview name="flowuniquename"/>
<apex:page>
Click Save.
Restrict which users can access the Visualforce page.
Click Visualforce Pages.
Click Security next to your Visualforce page.
Move all the appropriate profiles from Available Profiles to Enabled Profiles by using the ‘add’ and ‘remove’ buttons.
Click Save.
Add the Visualforce page to your Force.com app by using a custom button, link, or Visualforce tab.