If you want to turn off the sometimes inappropriate trailers that appear at the end of a youtube video you will need to locate the code as below and insert the red text (&rel=0) exactly as it appears in the picture below (the xxxx will be numbers).
picture dots - dot to dot puzzle maker - 2 views
iPhone Photography - 1 views
iPhone Photography: Advanced Exposure - 1 views
Pixabay - Public Domain Images - 4 views
Death to the Stock Photo | - 3 views
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