Open Widget → Appearance in the dashboard.
What you can change
- Accent colour — used for the launcher, the send button and your visitors' own messages
- Greeting — the second line of the panel header ("How can I help?")
- Launcher side — bottom-right or bottom-left
Choose Save & publish and the change applies to the live widget on your site.
When visitors see it
The widget file is served through a CDN with a five-minute cache, so a change reaches everyone within about five minutes. A hard refresh on your own machine will not make it faster — the cache is at the edge, not in your browser.