Hi Richard, welcome!
For HipChat Cloud*, you can head over to hipchat.com/account and log in with your email and password. Once you're signed in, you'll see a section with a button on the right side of the screen for adding a profile picture.
*You might have Server at your company, in which case the URL might be something like hipchat.yourcompany.com instead. Check with your IT administrators if you're seeing "account not found" at hipchat.com/account to get your Server address.
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...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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