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You can define the SLAs with the JQL that you need, in this case you must use severity field in your JQL, I recommend reading this website for more details (specially create and edit SLA goals) :
it seems jsd focuses on these options when a sla is created, but editing a current one like Himanshu is stating are not option for existing sla, rather only available when creating one. Jira really needs to focus on full edit capability vs re-creating a new one. Would save us a lot of time as most of what jira sd comes with, works - minus some minor edits that cant be done.
