You can follow these simple steps:
1. Click on the Investments section (bottom of the screen).
2. Click on the Investment Summary Card (where it shows your current amount).
From here, there are 2 way to redeem:
a) Click on the Redeem button on the top > Reason for redemption > Enter amount next to funds from which you want to redeem > Review > Confirm
b) Click on the fund from which you want to redeem > Redeem button > Reason for redemption > Enter amount > Review > Confirm
You can read more about how redemptions work in this blog.