If by JIRA Collectors you mean ability to embedd JIRA issues into Confluence then please take a look if you have option JIRA Issues when editing a page and choosing Insert. If not then since you are using OnDemand JIRA you will need to contact Atlassian OnDemand Technical Support - by filing a ticket at https://support.atlassian.com under the 'OnDemand' project.
I hope that helps.
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