Well, sometimes it's available on cable channels that focus on biographical content. You could also look on Amazon Prime Video. But availability can vary depending on your region.
Some cable networks or premium channels might show The Bobby DeBarge Story. Check your TV guide or the channel's website. Also, there are sometimes on-demand services through your cable provider that could have it.
The Bobby DeBarge Story might be accessible through subscription-based services. You could also keep an eye on TV listings to see if it's being shown on networks that you have access to.
It's very unlikely. As mentioned before, finding a free online source for the Bobby DeBarge story is difficult in the first place. And if there are any such sources, having subtitles would be even rarer. Subtitles usually require additional effort to be added, and free, unlicensed uploads are not likely to include them.