First off, Congrats on your first Mining Rewards! We hope this is the beginning of a long and prosperous journey for both of us.
Withdrawing your rewards is easy once you meet the minimum. To do so, first head over to your Mining Page. Once there, you can swipe over one time to the second card in place, and you'll see your withdrawal options there!
Please note, that there's a minimum SAT amount required for distribution of ~$5 USD (Sat amount will vary based on the price of bitcoin).
Here's a quick gif showing where it's now located:
As you can see, this section has multiple cards you can swipe through, and this "Invest your Rewards" section will always be in the 2nd place.