What are you repairing? (e.g., a jacket, tent, or backpack)
I can give you a more specific step-by-step for your exact situation. Inserting a slider onto a continuous zip
These tutorials demonstrate how to reattach sliders and use repair tools included in your kit: How to reattach/attach a zip head and mend your zipper YouTube · Made and Making
ReBIRD™ REPAIR | How To Put The Zip Back In Your Zipper (In The Field) YouTube · Arc'teryx Inserting a slider onto a continuous zip YouTube · MyDecozo
: Use the pliers to gently pull off the top stops and slide the old zipper head off the track.