#1: head over to https://overcast.fm/add and input your RSS feed, then click Add Podcast. Click here to see how you can get your RSS Feed.(in step 2)
Note that it will not appear in search results until Overcast can verify its inclusion in Apple Podcasts.
>> Overcast depends on your podcast’s approval on Apple Podcasts. If your listing is active on Apple Podcasts, it will typically show up in Overcast’s search within 1–2 days.