Sure, here's how you can remove your Apple Podcast history:

1. Open the Podcasts app on your iPhone or iPad.
2. Tap on the "Library" tab at the bottom of the screen.
3. Select the "Shows" option.
4. Find and select the show that you want to remove from your history.
5. Once you're on the show's page, tap on the "..." (three dots) button.
6. From the menu that appears, select "Remove...".
7. Then, tap "Remove Download". This will remove the podcast episode from your device, but it will still be available for streaming.
8. If you want to remove the podcast episode from your history entirely, you will need to swipe left on the episode from the show's page and select "Delete".

Please note that deleting a podcast episode from your history will not prevent it from appearing in the "Up Next" queue. To remove an episode from the "Up Next" queue, you will need to swipe left on the episode and select "Remove".

Also, keep in mind that this will not remove the podcast show from your library or unsubscribe you from the show. To unsubscribe from a show, you will need to go to the show's page, tap on the "..." (three dots) button, and select "Unsubscribe".