The smallest balance we send as a payout is $10. Your balance is sent automatically once it clears that minimum, by direct deposit to your bank or by INTERAC e-Transfer, so there's no button to press.
What you'll see under $10
On My Earnings, your approved money sits under Awaiting payout with the note "Sent once it reaches $10". New approved cash back adds to it. Once it reaches $10, the note changes to "Sent within 10 days · $10 minimum". If you've never been paid, the Payouts section says: "No payouts yet. Once your approved earnings reach $10, we send them within 10 days."
More on the rows: What do the balances on My Earnings mean?