To create your iSpring Cloud account:
Click Activate account in the email.
Fill out the authorization form.
Click Activate My Account to sign in to your account.
Once registered, you get access to the fully functional Pro version free for 30-days. With this free version, you can upload and share up to 100 presentations, videos, images, and documents.
If you want to apply for a Business account, go to this page and follow the steps above. Here you can find more information about the main differences between Pro and Business plans.