What are M S settings?
The m and s settings are settings determining size of medium and small images on the xz1. You are not likely to need to bother with them at all.
The other two posters are referring to two of the exposure modes , manual exposure and shutter priority.
'It is nice to be important but it is more important to be nice'
|Steamin' Mad by ahrensjt|
from Angered Subjects (Street Photography)
|Smile by Olymguy|
from Ultra Asian Indian Female Faces
|Space Shuttle Cockpit- by vbuhay|
from Aircraft Control Stick