Unravelling Back to a Lifeline
Hopefully you won't need to do this, but should you make a mistake and need to unravel back to your lifeline, this is how it's done.
Slide all of your stitches off the needle and remove any stitch markers. Unravel your work to the point of the lifeline.
Once you get to it you will see how it acts as a barrier to stop you unravelling any further. All of the stitches on the lifeline row are held in place.
To add the stitches back to the needle, insert the needle into each live stitch on the lifeline, following its path along the row.