-(If you haven't already) open the objects menu via pressing the magnifying glass on the top edge of the screen
-Scroll down in objects menu
-Click on "ENEMIES" tab
-Click on the Goomba
-The Goomba should just appear at your cursor
SMC can't use YT/TCRF links because of the way the sites are coded (or something similar to that.) If you want a custom song, you have to use Dropbox or File Garden. However, the URL format for those is different.
EXAMPLE: https://dl.dropboxusercontent.com/scl/fi/te2dz9er7kvaioyaie0eh/UFO-50-Maria-s-Theme-from-R...
All that's needed is for you to upload the audio file to dropbox, set privacy settings to "ANYONE WITH THE LINK" (or similar), set "www" to "dl", and add "usercontent" after the word "dropbox".
Angry bird
<Rawzie><ID>659575</ID><CustomName>Hlepmee</CustomName><tintables><tintable id="body">FF0000FF</tintable><tintable id="mouth">FFFFFFFF</tintable><tintable id="eyes">FFFFFFFF</tintable></tintables><accessories><accessory type="Eyes" accessoryID="Eyebrows">000000FF</accessory><accessory type="Pupils" accessoryID="Pupil5">000000FF</accessory><accessory type="Animation" accessoryID="Swimming">FFFFFFFF</accessory><accessory type="Noses" accessoryID="Nose2">AEAD00FF</accessory><accessory type="Back" accessoryID="Tail_fish">FF0000FF</accessory><accessory type="Top" accessoryID="Horns3">FF0000FF</accessory><accessory type="Sides" accessoryID="Collar">FF0000FF</accessory></accessories></Rawzie>