Well im not sure but the stickers on my keyboard say

Cntl B Brush Settings
N Paint Value Pressure
M Displacement Pressure

Something I have noticed as im working through some Digital Tutors Tutorials is when I select a Mesh it is Yellow with little squares on the corners were vertices join and the furthest edges are red? When I press the Soft Modifcation button the shading goes like this. I think im in the wrong mode but I am clueless on how to rectify the situation.

Ok whilst typing this i Pressed D which is marked as Edit mode and a S appeared in the centre of the screen (little one) and i was able to shift the faces and accomplish what i wanted. So how do i get rid of the little S now get out of whatever mode i went in to?