You will have to pull the elastic tight through the last two poles so hold it around your finger then tie a double knot at the end of the elastic cut ...
Most new tents have glass fiber poles with elastic running through the middle . These poles crack down the middle if you don't tighten your guide ropes enough to stop you tent moving to much . Most tent places like go outdoors keep used ones in stock from old display tents if you ask nicely they might give you a couple for free just tell them your tents less than a year old you brought from them.
Step 1: You Will Need.
Replacement poles Hacksaw Sandpaper A big needle Strong fishing line Marker pen Face mask