To use a Loop cut, you can either use the CTRL+R keys in Edit Mode or
the corresponding button from the Toolbar (Figure 3.11).
Figure 3.11 - Loop cut button
After pressing either the shortcut key or the button, you have to use a
small sequence of clicks to create and align the Loop cut:
1. Move the mouse cursor over an edge. The cut will occur in a
perpendicular direction from that edge.
2. Left-click once to confirm the direction of the cut
3. Move the cursor again to choose the location of your edge loop
4. Left-click again to set the location
5. To make your new Loop stay in the middle, you can press the ESC
key instead of left-clicking