As was mentioned, you should definitely look into troubleshooting your installation. Most of the time, it is simply that the Equalizer APO configuration has not been installed on the actual playback device that you are currently using.

With that said, start here to get back to the basics:

https://www.reddit.com/r/oratory1990/wiki/index/faq

And from the above FAQ, there is a linked YouTube video to go through the full setup steps as well:

https://www.youtube.com/watch?v=doAjkiLIkKA&list=PLFb68BU6_bvwQNIqgK7her48LPCong-PN

It's more daunting than it actually appears, so just take it one step at a time. You've got this. :)