How to turn on System Integrity Protection (SIP) for your Mac

[iMore.com]

System Integrity Protection (SIP) should be on by default but, if it isn't, you can turn it on at any time!

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[jmiller1417]

I just got my new 13inch MacBook pro last night. Within 5 minutes of using safari i got attacked by malware (new version of Flash). This never happened on my macs before this. Now I see that SIP was not enabled on my new mac. Do you think apple will fix this in an update? Thanks!