Hi,
Found this info in the link below, hopefully it is relevant to your problem:
http://www.jamaudio.com/jam-classic-wireless-bluetooth-speaker (scroll down to reviewer post 05/02/15)
''If you ever come across having issues with the speaker not pairing, and not showing up on the bluetooth devices list in your tablet/phone, do this. It worked for me:
1. Turn on speaker.
2. Press reset button.
3. Turn on again.
4. Press simultaneously the "PLAY" and the "+" buttons, until the blue light blinks faster (2-3 timer per second).
5. At this moment, the speaker should show up on your tablet/phone pairing list.
6. Pair the speaker. And you're set to go!''
Also another reviewer said to ensure that you should turn off one of your devices when you try to pair with the other as he found that it ''confused'' the speaker when both were on. (post on p.4 dated 12/03/14)