It's the main staff on the Tapas team who consider a community title! Editors are usually freelancers on Tapas!
I can say they look for consistent engagement, art quality, story quality, etc.
A good place to look is here on their website, though a comic/novel may also get invited to creator bonus program or early access.
It is totally possible to be invited by staff without these criteria, but it usually won't happen right out of the gate unless winning a rare contest. My one novel was invited from community but that was after it had accumulated 1M views lol.
I wish you luck on the Tapas platform! Just be consistent with uploading, engage with readers, market yourself on socials, and studying what has been doing well on Tapas. Perhaps seeing the staff picks and such.