I have an universal Philips Magnavox remote don't know the model # but I just need to know how to search for the codes. I can't remember how.

These are generic code search instructions for Phillips/Magnavox
Programing with Code Search

1. Manually turn on (TV,VCR,etc.) to be controlled.
2. Press and hold Code Search button until red indicator stays on.
Release the Code Search button.
3. Press and release the desired mode button (TV, VCR, etc.).
The red indicator blinks, then stays lit.
4. Press the Channel Up button repeatedly ( up to 300 times )
until the device to be controlled changes channel.
The red indicator blinks, then stays lit. If you accidentally
overshoot the code required, press the Channel Down button to
backtrack through the library until the device changes channel.
Pressing Channel Up changes direction to forward again.
Press and release the Mute button to install the code.
If the device you are installing does not have a Channel Up button
use Play(VCR only) or Power, on all other devices.