Backlinking HELP!

I use a backlink checker because i will know where my competitors put backlinks. But when i search for it i see hundreds of backlinks via Vinebox dot com and Insta7 dot com. But how do i put backlinks in these websites? It says ' These videos are being displayed here using the Youtube API and following the Youtube API policies'.

What does this mean?

You will not be able to place your link on all these sites as some of them are natural back links. Just do the ones you can and move on to the next. Don't waste your time figuring out how to place a back link on each site. Only do the easy ones. Best of Luck.