Moodle

I am a new user and would like to know if I need to purchase an account to create different content? 

Is there a way to disable/override the H5P activity auto resizing? Some of the activities appear way to big for the screen ( as they are displaying at 100% width) and are therefore unusable.

I've tried removing the dynamic sizing script in the HTML code and adjusting the width/height, but this doesn't work. Moodle just automatically puts the sizing back to 100% width! 

I have just upgraded to Moodle 3.11 from 3.3 assuming I would now easily be able to embed H5P content into a page or lesson but really struggling - tried everything I can think of.  I created content as an H5P activity but cannot see a way of using that (used to be a short code) - [h5p id="name"].  I tried recreating the activity in Content Bank which seems very straightforward - then using Atto tool to drop in the content on the page. But now getting an error...see attached image