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Adding a flow to a Confluence page is exactly like adding a form. Click the Confluence Add button and select the Flow menu item for Confluence v4.0 - 4.2. To add a flow to a page in Confluence v5, click on the Tools Menu and select Add Flow from the menu choices.
This menu item is available only when the Confluence add-on is correctly installed and configured and you are logged in to Confluence as a user with the appropriate permissions (you must be able to Edit the Confluence page and, if you configured a Form Designer group in the add-on configuration, you must belong to that group).
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