How to change the order of songs on spotify?

On your own created playlist:
load spotify on your computer or phone.
if on phone, go to playlist, click on the 3 dots in the top right corner, then select edit, then click and hold each song to move it up and down the playlist.
if on pc, click and hold on sing to move it up and down the playlist.

you can also arrange the music based on title, artist, album, and date added by clicking on any of those filters at the top of a playlist.

To remove a track from the  playlist , tap the warning symbol, and then select the delete button that appears on the right. when finished, tap the done button on the top-right of the screen. to  rearrange   a track, press and hold the horizontal lines and drag the track up or down into your desired position.