Tuning My Tv. Hey I have just been given an older NEC TV for my flat. I bought a cord to connect

Question

Hey I have just been given an older NEC TV for my flat. I bought a cord to connect the TV to the antenna plug in the wall. I turned the TV on and some of the channels were fine but when i tried to tune Channel 2 using the manual dials i managed to stuff up all the channels so now every channel is flickering.I have tried to tune them in but can't stop the flickering. It's just not tuning for me at all. I have found out that the TV came with a Phillips universal remote but can't figure out if this will tune the TV or not. I don't have any instruction manuals so don't know what to do. Do you have any ideas?