Aside from sharing the podcast with family, friends, co-workers, etc, the easiest way to support the show is rating and reviewing it in iTunes. iTunes and Stitcher determine "rankings" or the order in which podcasts are displayed by four key factors: 1.) subscribers 2.) downloads 3.) ratings and 4.) reviews.
So apart from actually downloading and listening to the show, it's tremendously helpful you if you go into iTunes, search "On The Line Podcast," rate the show 5 stars ⭐️⭐️⭐️⭐️⭐️—and if you're so inclined, leave a few nice words.