For the moment, the application WhatsApp is not embedded into the Glympse application. You can, however, still send Glympses through WhatsApp.
First, select 'Share Location' from the main menu and then select the blue 'plus' icon to add a recipient. From there, you can choose to "Copy to clipboard" and follow the arrow back to the share page (top left back arrow). From here, you will see that "Copy to clipboard" has been added to your recipients list. You can send the Glympse by selecting the top right arrow. At this point, you will need to exit the Glympse application and open your WhatsApp application manually. From here you can paste the Glympse link (that was previously sent to your clipboard) into any WhatsApp message.