1. Attach the loop to the lid and apply pressure until it clicks into place.
2. Ensure that the collar is attached tightly to the body of the bottle. In order to do this, use the lid to tighten the collar against the body of the bottle, then unscrew the lid from the collar. It may help to hold the collar in place when unscrewing the lid.
3. Do not over-tighten the lid against the collar when screwing it in.