Alternator replaced now explorer won't crank or start start

What is your question?

I changed my alternator on my 2004 Ford explorer and I didn't unhook the battery and now it has a no crank no start it's none of the fuses I've checked the relays and I've tried to bypass the anti-theft system but I'm not sure if I did that right. We can get it to crank from the engine but not from the key. Any ideas