1. Choose your ringtone file format. MP3 and M4A are the most popular formats, but there are others. 2. Find a ringtone website. There are many websites that offer free ringtones, but make sure to find a reputable one. 3. Download the ringtone. Once you've found the ringtone you want, simply click the "Download" button. 4. Transfer the ringtone to your phone. This will vary depending on your phone, but you can usually do this by connecting your phone to your computer and transferring the file over. 5. Set the ringtone. On most phones, you can set your new ringtone by going to the "Settings" menu and selecting "Sound." From there, you should be able to find your new ringtone and set it as your default.