To get started, simply login into iFunnels (if you don't have an account, you can get one here), then:
Go to Studio, click Create New Funnel, a popup window will appear:
Then click Launch the builder:
It will load your funnel inside the editor.
From there you can navigate the pages, check the Instructions page and edit your payment link or domain names in the legal pages.
If you need more instructions to use Studio, please check the tutorials HERE.