The site congratulates me for moving to the next week yet I haven't started

Hi Molecular,
Thanks for posting!
Please note, there is no time limit with regards to how long you spend on each week. You can take your time, and go at your own pace. Once you complete a week it will automatically unlock the next week, but you can remain in the week you are on, and also return to previous weeks should you wish.
Hope this helps. If you have any questions, please let us know.
Best 🙂