I have an existing Kanban board.
I configured the board and added a new column "Review/Testing" and a new status "in review" within the Review/testing column.
However when I view a issue, the workflow button, with the dropdown, show the 'in review' status at the end (after done). How do I change it so it comes before "done" ?

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That's the standard issue view, not the Kanban board.
You can change the order by telling JIRA what order you want them to appear in the workflow. Have a look at https://confluence.atlassian.com/adminjiraserver071/workflow-properties-802592825.html and look at the opsbar.sequence bit.
Sorry for the dumb question, but how do I update that? IS it in the settings? or is it a file i need to edit?
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You'll need to log in as an admin and edit the workflowto add the properties.
Have a look at the sidebar to the left of the link I gave, I think you'll find you're quite deep in the documentation tree, but also beneath something like "working with workflows" which is probably a good starting point for workflow updates.
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