You must have an Indeed account to upload a CV. You can create an account by clicking the Sign In link in the upper right corner of any Indeed page. Click Create an account free to register your account.
Once you've registered your account, click the CV link (top right). Alternatively, click the arrow next to your sign-in email address (also top right) and click the CV link. From this page, you can create a CV from scratch or upload an existing file.