Hey go into obs settings :
Stream TAB and change Stream Type to "Custom streaming service"
Your url is :
And stream key is :

It should look like that :
https://gyazo.com/7559dc9cc4a7b7fce7ebae27b59a002d

Then go into output :
Video Bitrate : 6000 (if you have slow internet use 3000)
https://gyazo.com/83e8c39eb0648fca4d337b7196c1e146

Then go into Audio :
Sample rate - 48khz (if you changed that you need to restart OBS !)
https://gyazo.com/000a37680f32845ae49e65b2dc7c56e0

Then go into Video :
https://gyazo.com/947af3687d4ef259376bd946a34d46e6