

It needs to have I2P trackers, most popular one is http://tracker2.postman.i2p/announce.php, and it doesn’t accept clearnet trackers. Once you download and configure I2P, seeding should be easy, because there is a torrent client included in the install.
Guide to config your browser, after you run the I2P. https://geti2p.net/en/about/browser-config
Maybe there is other I2P tracker, which accepts clearnet trackers. But even if you use Postman, I think you can still seed on clearnet, you would be discoverable by DHT.