How to setup Cloudflare Turnstile
Go to the Cloudflare website, sign up for free and create a new site.
Add the necessary domains your site will be accessed by into the fields provided.
Take note (or keep the browser tab open) of both the Site Key and the Secret Key. You will need these for the next step.
Login to uSkinned Site Builder CMS.
In the tree menu, go to 'Global'.
From the grid, select 'Settings'.
Go to the Form tab > Choose Turnstile > Paste your Site Key and Secret Key into the respective fields provided.
All out-of-the-box uSkinned forms will now run successfully with Cloudflare's Turnstile spam protection.