To connect your Google Analytics data to Funnel, select Data sources in the left-hand navigation bar:
Hit "+ Data Sources" to open up the data sources popup and click the Google Analytics button in the top right:
Connecting Google Analytics is thereafter done in 3 steps:
Select what Google user to authenticate with
Give Funnel permission to access your data
Select what Google Analytics views to connect
Each Google Analytics View you add will be listed on the Google Analytics page. You can see their respective status, remove them, as well as reconnect them if necessary.