use link2sd.
you need root (supersu) , init.d already active & partition on sdcard (2 partition: fat32 & ext4). Use sdcard class 10 or more.
There is a video tutorial for using WSM/ Xposed. Go search that. Or you may wanna use Link2SD like exodius48 has suggested. All you need is Root enable and Link2SD and partitioned SD card. Use AParted for partitioning the SD card. Remember that it will erase every single datum on the SD card. Browse Google for more information on Link2SD and AParted.