For questions about using the web interface of HipChat, Atlassian's service for internal private online chat and instant messaging. Questions on smartphone or OS-native apps are off-topic at Web Apps.
HipChat is a webservice for internal/private chat. It is part of the Atlassian suite of products, with Jira, Confluence, and BitBucket. It uses a Freemium model, with versions available for Windows, Mac, Linux/Unix, Android, and iOS, in addition to the web client.
Note: Questions about the non-web-client apps are off-topic at Web Applications.