Installation and server related problems

Hello folks,

I've installed a Moodle server for my organization but I have difficulties with using the h5p plugin. The problems are the following:

When I try to create content I get the following message:

"No content types are available

Your site is having difficulties connecting to H5P.org and listing the available content types."

When I try to update the H5P Libraries Content Type Cache I get the following message:

"Site could not be registered with the hub. Please contact your site administrator.

We use the H5P for our academy and now people who are logged in (via wordpress) can also see and adjust these tests. The students are registered as subscribers. But if they login with wp-admin they also see H5P. What can I do to shield this from everyone except an administrator?
I have attached a screenshot.

Hi everybody,

I installed a local Wordpress website with XAMPP on a Mac.

When tried to install H5P plugin, Wordpress asks me FTP credentials and I don't know how to do.

Tried to put H5P folders directly from GitHub to -Plugins folder in my local installation but it doesn't work and Wordpress notificates me with a generic error message.

How can I install H5P plugin(s)?