When you put "uid","xxxx","password","xxxx","signform","signin" into Post Data filed it will automatically transform to "uid=xxxx&password=xxxx&signform=signin" with Content Type set to urlencode, which is default
@support
face palm I feel like an idiot now. I had it setting the host because it was returning Method not Accepted error. I looked at the traffic again and figured it's the URL of the post/get's changing them, used the correct Host. Thank You, you rock.