First thing's first: if you don't already have a Notion account, you will need to create one, free. When you follow the link to any cloneable link, you'll be prompted to create an account before duplicating.
If you have an account, you'll need to hit the 'Duplicate' button in the very top right menu of the Notion workspace. After you do so, it will prompt you to select which Notion workspace you want to duplicate this template into.
Select your own personal Notion workspace (or wherever you'd like the template to appear) and voila! It will be copied to your own personal account. From there, you will have full edit access--so you can tailor and link it to other parts of your account as you please.