Hi Clare,
With most modern versions of Word you should be able to convert a PDF to a Word file. To do this you will need to download the PDF onto your computer. In your file explorer, open your downloads, find the document in the list and right-click on it. From the drop-down list, click on 'Open with'. If you don't see Word on the initial list you can select 'Choose another app' and then find Word in the list.
Word should then give you a pop-up saying Word will convert your PDF and you just need to click on 'Ok' to proceed.
I hope this helps.
Emily