Here I found some docuementation about the Jira and Confluence integration:
Of course to do the integration you need to have the Standalone version and not the OnDemand version. Plus I'm not sure you can have both in the same address, you will have them in two different but with information connected.
Judging from your base URL, it seems that you are on OnDemand. If you want to have Confluence integrated on your current address you might want to contact:
Hope it helps.
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