I have 101 reputation, but I can't make an answer to How do you add a Windows environment variable without rebooting?

Is there any other requirement to answer protected posts? The thread tells me: "To answer it, you must have earned at least 10 reputation on this site."

When I signed up for the site it told me: "You've earned a bonus 100 reputation because we trust you on other sites on this network"

It seems that the wording in this message is wrong if earned reputation is considered different from the 100 reputation given.