Open Spotify and start playing a song, album, or playlist
Tap or click the Now Playing bar
Find the repeat icon, which looks like two arrows in a loop
Tap or click it once to repeat the current playlist or album
Tap or click it again to repeat the current song only
Tap or click it a third time to turn repeat off
On mobile, the repeat icon is usually near the shuffle and previous/next buttons
On desktop, the repeat icon is usually at the bottom playback controls
If repeat is not working, make sure shuffle is off if you want the same song to play again continuously