If you're not currently a member of the administrators group then you can follow the instructions in this document to create a new user with admin permissions, or even just assign admin permissions to your current user depending on how you prefer to do it: https://confluence.atlassian.com/display/DOC/Restoring+Passwords+To+Recover+Admin+User+Rights
All the best,
You cannot install plugins on OnDemand, and the administrators role is limited to Atlassian.
See https://confluence.atlassian.com/display/AOD/Restricted+Functions+in+Atlassian+OnDemand for the details of what you can and cannot do.
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