Below is a link to sign up to your free account. You will be directed to this page on submission of this form.

The account includes 5GB of free space. This should be more than enough for your needs, however should you wish to expand at any point to add an additional 20GB of free space then you can do that for £1 per month. 

https://www.sync.com/free-cloud-storage-from-trial/

Your portfolio link will be emailed to you seperatly. NOTE - You don't need to sign up to a paid account and if you are in a situation where you are being asked by Sync.com to pay for an account you can feel free to decline it.