All you need is just one part of the URL.
" EXAMPLE: if your embed code URL is <embed src=https://www.youtube.com/v/Dgvd9_Ts1>, you enter only v/Dgvd9_Ts1 "
So take from the URL only "v/Dgvd9_Ts1", or whatever number / letters that your video's URL has.
Then enter it in the given profile area.