This plugin doesn't work, and it seems it has to do with the usage of getimagesize in the code which (I think) is dependent on "allow_url_fopen" beeing enabled, and on many shared hostings it is disabled for security reasons.
In the admin settings, it show two errors in red:
"File wp-content/plugins/motivation-generator/fonts/FreeSerif.ttf not found."
"/wp-content/uploads/posters/ Can not be created. Please check your file permissions."