Due to the growing number of XSS vulnerabilities in WordPress, we restrict access to the editor for user roles without 'unfiltered_html' capability.
The capability is enabled by default for Super admin, Admin, and Editor.
If you wish to use Visual Composer by other user roles, make sure to enable 'unfiltered_html' capability for a specific user.
To control 'unfiltered_html' capability, you can use User Role Editor plugin.
Note: If you are a Contributor, Author, or another non-admin or editor user of the site. Please contact your site administrator.