API not found?

Hey everyone. I am new to the whole API scene but recently started looking into Stickam's apistream, signed up for it and am trying to figure out how to use it. I went into the admin section of my Elgg 1.5 based website, went to Api Administration and tried to input the public api key, and when I click generate it takes me to a "Not Found" page displaying that "The requested URL /actions/apiadmin/generate was not found on this server." 

Does anyone have any clue what I am doing wrong?