Firstly, you need to connect your FB page to your Mixcloud account. You can do that by going to your profile > Settings > Connect.
Once this is done, a new tab will appear stating "Facebook Fan Page Connect".
Select the page(s) you want to connect and then click "Add tab to Facebook Pages". As soon as you do this, a Mixcloud tab will automatically show up on your Facebook page in the App section on the left side of your page.
To make it go under the 'About' section, just click on the small 'Manage' button next to 'Apps' like in the image below and drag the 'Apps' tab to the top.
You can make your Mixcloud tab display on the main Facebook page without having to click on 'More' (like in the image below)
To turn this on all you need to do is:
- Go to your page Settings
- Go to the Apps section
- Click on 'Link to this Tab'