Whilst Melomania 1+ can pair with and remember up to eight devices, they can only connect to one device at a time as a pair.
If you would like to share the earbuds with another person, have the other person pair to their bud of choice whilst the other remains in the case. Once this is complete, take the other bud out and it should pair automatically to the last connected device.
Please note, however, you may need to follow the initial pairing process the next time you use the buds as a stereo pair. Also, the volume and skipping controls will still only use function on each bud i.e. the left bud will always skip back and reduce the volume only.