Resetting computer I entered the wrong 4 digit code for my anti theft, had to disconnect it because the car wouldn't start. How do I reset.

Any DTC Diagnostic Trouble Codes?

There are so many things that could be wrong. The best bet is always a good auto-electrician with a pro grade scan tool computer.

Before you disconnect your battery ,suggest you read this
https://dannysengineportal.com/car-battery-before-you-disconnect-it-know-what-can-go-wrong/

Ford's PATS anti-theft system disables the starter from spinning the engine . Flashing real fast while trying to start the vehicle means the vehicle see's wrong key code ,think's the vehicle is being stolen . Code's stored in the computer , FORD dealer , nothing you can or should do .

What code?

disconnect battey from vehicle give computer time to reset itself then make sure you properly put cable back on battery

I'm guessing that you disconnected the battery recently! but if you contact your dealer they can pull the code for you, you may have to take it to them so they can connect the scan tool and get the code that way!

If you are secure that the repair was done correctly, pull the 7.5 backup fuse (with the car turned off) in the under hood fuse box and wait 10 or 15 seconds before putting it back in. That should clear your engine light. You will have to reset your clock, and any selected radio settings.
If you do not have an anti-theft radio, you could simply disconnect the negative battery terminal for 10 or 15 seconds and that would do the same thing, but if you have an anti-theft radio that would require a code reset, meaning that you would have to have the five digit code.
If the engine light comes back on after the reset, then something has gone wrong with the repair.
Hope this helps.

the anti-theft system is tied into main computer system, try disconnecting the neg battery terminal for about five minutes. if that doesnt work then it will have to be reset by the dealer

turn the radio off push preset buttons 1 &6 while holding these buttons turn on the radio the serial# will come up call the dealer with this # they should give you the radio code if you have a problem write back i can get it for you if you have error on the radio then disconnect the battery cable neg for aprx. 30 seconds reconnect the enter the code using your preset buttons