OK I was concerned you may have over filled with oil, but by checking with the dip stick you are assured of the correct oil level. I can't see how your attempt to reset the FFS oil interval setting could cause the car to go into limp mode. Your instructions are almost word for word from the owners manual. So you should be able to reset the interval like it says. The recommended oil change interval is 7,000 miles.
waldig is very experienced with these cars. His advice to check for codes is your next step and texas t also gave you a very good tip concerning an oil leak. If it is there you wont see it on the ground, but it will be dripping oil onto the plastic underside engine cover. Remove that cover and take a look there for any fresh oil.