The lifeline is used when ascending or descending the tree. You first have to climb into your stand and reach above your head and attach the long lifeline by slipping the longend through the loop at the top. Now when you descend you attach your harness tether to the prussic knot on the lifeline and descend. When you get to the bottom and disconnect from the prussic knot tie the lifeline to secure it at the bottom so you can ascend without the line getting limp and weak. The lifeline should be directly opposite from where you climb on the tree so you will need some slack in the lifeline.