Each week there will be a worksheet to download. It will be a PDF file that you can fill out. You can also just use them as a guide and fill out a piece of paper too. It’s up to you.
When you download a worksheet and open it, it might open in your browser, such as Google Chrome.
Google Chrome does not allow filling in of PDF files. You will therefore need to open the PDF in a separate application in order to fill it in.
If you wish to fill out the PDF directly, then here is a list of free apps that I have found to work.
All these apps should allow you to save your changes.