Where do I add the origin-K line too. It looks like a lot of threads are out of date.

Go to the game's folder (Manage Installation -> Show Folder) and open up dosboxWC_single.conf

Look for the following line:

loadfix -1 wc

Change it to:
loadfix -1 wc Origin -k
(note the capital O in Origin)

If you want it for Secret Missions 2 as well, then look for the following line

loadfix -1 sm2

and change it to:
loadfix -1 sm2 Origin -k