Q: How can you put on your mike for an app?

Hello Dani,

Thank you for the details of the issue you are experiencing with audio when using the Vine app.  In my experience, this will happen if the Ring/Silent switch is activated (showing red).  First, try enabling audio by toggling the Ring/Silent switch on the side of the iPhone. 

iOS: Understanding sounds, ringtones, and alerts

http://support.apple.com/kb/HT5800

If the Ring/Silent switch is not activated and you are not able to hear audio with any other apps without your headphone being connected, I recommend following the steps in this article: 

iPhone: No sound or distorted sound from speaker

http://support.apple.com/kb/TS5180

Alternatively, if you are experiencing the issue with only Vine, I recommend following the steps in this article:

iOS: Troubleshooting apps purchased from the App Store

http://support.apple.com/kb/TS1702

Thank you for using Apple Support Communities.

Best,

Sheila M.