Get the manual here: https://www.sony.com/electronics/support/e-mount-body-nex-3-series/nex-f3/manuals
There is an option in the set-up menu for release without lens in there.
That should solve your problem
Menu --> Settings --> Shooting settings --> Release w/o Lens --> On
Sometimes I wonder why people take the effort to ask a question while a simple Google-search on 'Sony Alpha NEX-F3 manual' will get you the result in less than a minute...
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