The mobile app doesn't show the sidebar from completing tasks. You can create tasks from chat with /todo. How can you mark tasks completed from chat, something like
/todo complete TKGP
where TKGP is the task id
It sounds like you're using some kind of TODO addon? The feature you're describing isn't something built into HipChat itself, but provided by a 3rd party integration. I would suggest trying just the "/todo" slash command alone, which might give you a list of commands you can use (and maybe one of them allows you to complete the todo).
If that doesn't work, I would recommend contacting the addon creator directly. You can find addons by searching on https://marketplace.atlassian.com/home/hipchat. It's possible that the option you're looking for exists, but is hidden somehow. Otherwise, you can always suggest that it get added in a future update.
Hopefully that helps answer your question!
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