TROUBLESHOOTING: (streaming from Mac) (Patreon)

So I'm not how many may be familiar, but I downloaded OBS for my Mac Pro 4,1 and I've been trying to get a stream going on picarto. I've adjusted all the settings and ran through a handful of tutorials, but I just can't seem to get the stream to broadcast to picarto... I don't get any error messages or anything like that. I press start stream and the picarto channel just loads up a blank screen? Im wondering what it may be keeping the software from streaming? :( any suggestions?...