Hi Paul Barnes,
Thank you for reaching out to us on Microsoft Q&A forum.
Please click on the link as provided in the below.
https://www.microsoft.com/en-gb/dynamics-365/free-trial
Upon clicking the link, you will be directed to a page where you can find the "Try for Free" option. Provided in the screenshot Please click on that.
By selecting the "Try for Free" option, you will be presented with a reference screenshot displaying the available free trial options for Finance and other modules.
Please provide work mail address. If you try to sign up with a personal email address, you'll receive a message indicating that you need to use a work or school email address.
Upon submission of the work email address, you may proceed with commencing the free trial process to practice the session for one month.
If you are still facing any issue, please let us know in the comments. We are glad to help you.
If the information is helpful, please Accept Answer so that it would be helpful to community members.