Follow the instructions for Setting Up RSS Webhooks, with the following settings:

FEED URL: http://services.runescape.com/m=news/a=13/latest_news.rss?oldschool=true#_ga=2.247374465.482.1521576112-941724446.1511529601

AVATAR_URL: pbs.twimg.com/profile_images/568358346785177600/OCsnjqnz.png