do I type that in the Terminal?
Yes, in Ubuntu, you would type that in your terminal. It will update your boot-manager's menu-entries (hopefully then Windows will appear).
I set up the Partition manually and hopefully I did not cause any damage to Windows in the process.
If after running the previously stated command you still cannot boot into Windows I would suggest adding a screenshot, or terminal output of your hard-drive partitions. It will be a huge asset to anyone who trys to help. To do so, open your terminal and type "sudo parted -l", highlight all the text in your terminal, right-click, copy the text, then on Bleeping Computer click the <> button to make a codebox, and paste the text from your terminal into it so you can add it to your post. You might also provide a link to this youtube video you mentioned.
Until you have fixed this issue I suggest downloading SuperGrub2Disk, and burning it to a disc. It should be able to boot you into Windows 7 and Ubuntu. It will not fix your issue, but you can use it temporarily to access both operating systems while you wait for your current issue to be solved. It's an invaluable tool.