1. If you want to modify the Glympse you sent from iMessage, open the Glympse by tapping on the image in the message itself.
2. Click on the pencil or +15 buttons 
to edit the Glympse length of time.
3. Click on the 
to stop sharing your location.
4. Once you have done this, you will be able to modify the Glympse as seen below. Alternatively, you can open the Glympse app and modify your Glympse from there.
