1 - On the client, where you have the list of missions, click the link called "Watch 2 MSI Games". This will open a browser window on the correct esports website.
2 - Login on that website (top right corner).
3 - If no game is currently playing, select the VODS tab (top of screen), slightly to the left).
4 - Under "Regions & Events", make sure "MSI" is already selected. If not, click it.
5 - From the list of games, pick one, at your choice, and let it play for, at least, 10-12 minutes. After that time, check your client, and you should see half your progress bar is filled.
If nothing happens, check to see if you have "Rewards" activated (on the same menu where you clicked "VODS" before (top of the esports page), a bit to the right of "VODS", you'll see a link called "Rewards").
6 - Once that's done, go back to the "VODS" list, and pick another game (different from the first you watched before). Again, let it play for 10-12 minutes.
That's it. If you have your client open, you should hear the "mission complete" sound, and you should have the reward instantly added.
2 - Login on that website (top right corner).
3 - If no game is currently playing, select the VODS tab (top of screen), slightly to the left).
4 - Under "Regions & Events", make sure "MSI" is already selected. If not, click it.
5 - From the list of games, pick one, at your choice, and let it play for, at least, 10-12 minutes. After that time, check your client, and you should see half your progress bar is filled.
If nothing happens, check to see if you have "Rewards" activated (on the same menu where you clicked "VODS" before (top of the esports page), a bit to the right of "VODS", you'll see a link called "Rewards").
6 - Once that's done, go back to the "VODS" list, and pick another game (different from the first you watched before). Again, let it play for 10-12 minutes.
That's it. If you have your client open, you should hear the "mission complete" sound, and you should have the reward instantly added.
Having said that, his account may be old, so I edited my original answer to add how to check if "Rewards" are on or not.