"You'd need to edit the template mark up as explained in the themer's guide"

Running latest WP anf theme on fleksjobbernetvaerket.dk I'm running the free plugin "The Event Calendar" and the PRO plugin "Community Events". As you can see on the frontpage, these plugins output some arrangments (look under "Arrangementer" in the left side. I recently asked them "Each event is pressented with two lines – Can I have it in one line?" They replied to me "This is possible but a bit more complex. You'd need to edit the template mark up as explained in the themer's guide." How do I do this? thanks Knud