When it works right, its easy. For me, as a player who helps others (which is why I have green text), I try to help as many players as I can. I try to reach out to Blizzard when there are major issues of course. However these streaming promotions have rules and restrictions, and there can be technical hurdles.
To prepare I strongly recommend tuning in this early morning for the semifinal matches and at least match sure you are earning the free Overwatch League tokens. If those are dropping, you should be able to earn the spray and skins when they are available on Saturday morning.
If it is not working, I have an advanced troubleshooting guide here: