The guidelines given in this don't work: https://confluence.atlassian.com/display/DOC/Customising+the+Getting+Started+Guide+on+the+Dashboard
There is not available:
The documentation you are referring to is for the Server instance and you are using Cloud. And since you are using Cloud, this is currently not possible.
This issue is being tracked at https://jira.atlassian.com/browse/CONF-28255. You might want to vote for the issue.
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