Update captcha instructions in HOMEASSISTANT.md

I had trouble with the current instructions to find the correct link in dev tools. After seeing the instructions is https://github.com/bbernhard/signal-cli-rest-api/issues/706 I could easily get it to work. 

Updating the instructions here per issue above, as this seems much more accessible / easy than trying to find this in dev tools. 

cc @wassong since you shared those in https://github.com/bbernhard/signal-cli-rest-api/issues/706 (thank you!)
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Jakob Reiter 2025-07-22 23:16:47 +02:00 committed by GitHub
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@ -132,13 +132,12 @@ curl -X POST -H "Content-Type: application/json" --data '{"pin": "your registrat
### Trouble shooting: A captcha is required
If, in step 1 above, you receive a response like `{"error":"Captcha required for verification (null)\n"}` then Signal is requiring a captcha. To register the number you must do the following (in Mozilla Firefox):
1. Go to [https://signalcaptchas.org/registration/generate.html](https://signalcaptchas.org/registration/generate.html)
2. Open the developer console
3. Answer the captcha
3. On the developer console, find the line that looks like this: `Prevented navigation to “signalcaptcha://{captcha value}” due to an unknown protocol.` Copy the captcha value
4. Use it to make the registration call like this:
2. Solve the captcha
3. Once successful, a "Open Signal" button will appear below the solved captcha, right click it and select "Copy Link" or "Copy link address".
4. Paste what you just copied as `<captcha value>` in the example below. (The content will be a very long string starting with something like `signalcaptcha://signal-hcaptcha...`)
```sh
curl -X POST -H "Content-Type: application/json" -d '{"captcha":"captcha value", "use_voice": false}' 'http://127.0.0.1:8080/v1/register/<number>'
curl -X POST -H "Content-Type: application/json" -d '{"captcha":"<captcha value>", "use_voice": false}' 'http://127.0.0.1:8080/v1/register/<number>'
```
## Sending messages to Signal Messenger groups