It's not as easy as you think.
You'll need to learn how to make AudioProfiles in Blockland's coding language. I'm assuming you don't know how.
Here's how you can, sorry if you can't understand it properly:
Get Notepad++ or Sublime Text, doesn't matter which one
Create a folder in your add-ons folder (if you don't know where to save it, look at the add-ons board of one of the sticky topics that Badspot posted) with "Sound_someNameHere" do not include spaces (you can use underscores though).
In the Sublime Text/Notepad++, create a new file and put something like this: Everything in bold is what you should change
datablock AudioProfile(SomeNameHereDONOTUseSPACESSound)
{
filename = "./SoundNamer.wav";
description = AudioClosest3d;
preload = false;
};
Save this piece of code into the folder as "server.cs", this is for every wav you have, so each wav will need this related piece of code in it. All the code goes into the "server.cs"
Make sure you include a description.txt (You can just use windows notepad) or it will not show up in the add-ons config.
When making wav files (blockland only supports wav and ogg, but use wav for sounds), use Audacity and make sure they're split to 1 channel (mono), otherwise they will not work.