It depends on the nostr site you are trying to access and whether your nsec is in a nsecbunker (at this stage of things, the chances of both are slim unfourtunatly)
Assume no nsec, no nostr keys outside one of the popular social media apps.
No knowledge of or access to nsecbunker.
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Use any of the sites that allow you to create an account remotely.
Nothing to install.
Can you point me to the easiest 1-3 sites that allow key creation on mobile safari iOS?