Your SoundCloud ID helps identify your artist profile on SoundCloud.
To find your ID, just head to your Soundcloud Artist Page and copy the URL as shown below.
This URL is your Soundcloud ID.
Don't forget to provide your SoundCloud ID before you upload new releases to SoundCloud. This will make sure your music is always mapped to the correct artist profile.
You can enter your SoundCloud ID for any artists on your account by pasting it into the SoundCloud ID field.