To connect your Google Analytics data to Funnel, select Data sources in the left-hand navigation bar as instructed below:
Hit "Connect Data Sources" to open up the data sources selection page and click the Google Analytics button.
Make sure you have at least a "Viewer" role on the property you are trying to connect. Read more about access management for Google Analytics here.
Connecting Google Analytics in Funnel is done in 3 steps:
Select which Google user to authenticate with.
Give Funnel permission to access your data.
Select which Google Analytics account to connect.
After following the previous steps you will be asked to select which fields to import into Funnel. You can read more about what data to get here.
After successfully having connected your data sources you can see their respective status on the data source's page, remove them, as well as reconnect or edit them if necessary.