The ^ means Ctrl. So if you've made a change, Ctrl + X, then y to save changes, then enter to save the file name. You may have to edit certain files using sudo, if you get the permission denied on saving. Then that's why.
Correct me I am wrong, as of now we can post only a particular board, right ? We can simply change the no. 4 /5 or one of our choice. Also Custom home page header vanishes when I click the logo button.