How can I unlock it (Audiovox tv)?

I was trying to program my Audiovox TV to my Philips universal remote control when all of a sudden an image of a little red lock appeared in the bottom left corner in the screen of the TV, so I never got the remote to work and now it wont even let me change the channels manually because of that lock (the only thing it lets me do is turn the tv on and off), anyone knows how to remove it?
Thanks in advance.
More details: I followed the steps found in the internet: 1) With my tv on I pressed the search code button until it stayed on. 2) I pressed the tv button once. 3) I started pressing the channel up button repeatedly and this was supposed to program the remote but the only thing it did was make that little red lock image appear on the screen of my tv and now I can't do anything!