4.86 rebug installed; Can I create PSN account?

I forgot to create a PSN account/login when I installed CFW. I didn't realize this would create problems with licenses. I don't want to game online or anything. Just wondering if I can connect my ps3 to the internet and create a PSN account on my 4.86 rebug lite without screwing anything up? I turned off automatic update, but I wasn't sure if logging into PSN would require an update or something?

Thanks