looks like it's a custom theme developed by somebody else.
There are several options you should check.
Check if the module is available for templates and pages(red highlight). If it's like in the screenshot, enable it by clicking on the toggle and saving it.
Check if the module is available for the page-type you're working on(blue highlight). Modules can be template specific(Page, Blog, E-Mail). If your page type is not included - select/add it and save the module.