on onDemand you won't be given system admin rights.
You will have to ask the user to make you an admin of the space or get help from Atlassian support.
System Administrator permissions is reserverd to engineers for troubleshooting purpose as mentioned here. However, your administrator rights should allow to do that. Please do refer to this: https://confluence.atlassian.com/display/DOC/Deleting+a+Page
There is no need for system administrator permission. Normal administrator permission is sufficient.
You can delete the space from the Space Tools section by going to Overview -> Delete Space.
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