Plugin customization

Greetings!

I would like to use CCS Editor to edit the CCS of template 1 of this plugin: https://wordpress.org/plugins/wp-landing-pages/
Basically I just want to add an image to the top of the black box and few text fields with clickable links to its bottom.
How do I pint CSS Editor to the llp_tpl folder of the plugin?

In the below URL I have juxtaposed the present active plugin with a background image of how I would like to modify the plugin.

Thank you so much!
Best,
troncaleno

URL: http://globalmobilityexperts.com/real-estate