Apple has made the second public beta of iOS 13 and iPadOS available today to those who are enrolled in its public beta program. If you have already been running the first public beta on your iPhone or iPad, this release should arrive as an over-the-air software update very soon, if it hasn't already. If you want to manually check for it, go to Settings > About > Software Update. If you are on a stable iOS release but want to try the beta, head over to Apple's dedicated site for the beta program to enroll your device. Just keep in mind that bugs are inevitable, so it's probably not a great...
Source: https://www.gsmarena.com/apple_outs_second_public_beta_of_ios_13_and_ipados-news-38009.php