The shortcut for a "Loop cut and slide" is ctrl + RCtrl+R. Use the shortcut (while in edit mode) then hover your mouse over the mesh edjesedges and you will see a pink loop.Left Left click to apply it, then move the mouse (to slide the loop ) and left click to apply again . ifIf you want more options (after doing this) hit "T"T to open toolbox, and you will see more otionsoptions (see image below).
Hope this helps and feel free to ask ;)