To add a video for Benjamin Carr / Sonatina for piano with violin or flute ad lib, Op. 9/1 (Progressive Sonatinas, No. 1), just enter the video‘s YouTube link:
example) https://www.youtube.com/watch?v=XXXXXXXXXXX
Search YouTube for Benjamin Carr / Sonatina for piano with violin or flute ad lib, Op. 9/1 (Progressive Sonatinas, No. 1)