1. Create an account on free web hosting website, like Soundcloud or Audiomack.
2. Upload your MP3 file to your account.
3. Copy the embed code for your MP3.
4. Log into your Piczo account.
5. Click on "Pages" and select the page you want to add the MP3 to.
6. Click on the "Add" button and select "HTML."
7. Paste the embed code for your MP3 into the box.
8. Click on "Save" and your MP3 will be added to your Piczo page.