go to your profile picture in the top left corner of the screen go to settings, go to account select microphone switch it to on. Then you should be able to learn how to speak.

There isn't. But I reccomend you to watch this video, it's really helpful

https://www.youtube.com/watch?v=FTgaw8e4Pic

Well, you only will repeat the words on the screen in Duolingo. It doesn't give you the ability of speaking in your target language.