To resolve the issue of the RCA Signal Finder app crashing when you try to add your address, follow these actionable steps:

1. Restart Your iPhone:
A simple restart can often clear temporary glitches that may cause apps to crash. To restart, press and hold the power button until you see the 'slide to power off' option. After your device powers down, turn it back on.

2. Check for App and iOS Updates:
Ensure both the app and your device’s operating system are up to date. Go to the App Store and tap on your profile icon to check for updates for RCA Signal Finder. Also, go to Settings > General > Software Update to see if any updates for iOS are available.

3. Adjust App Permissions:
Sometimes, app crashes can result from insufficient permissions. Go to Settings > RCA Signal Finder and ensure that all necessary permissions like Location Services are enabled.

4. Free Up Storage Space:
Lack of storage can lead to app instability. Go to Settings > General > iPhone Storage to see how much space you have available. If it's low, consider deleting some unused apps or files.

5. Check for Network Issues:
The RCA Signal Finder app may require a stable network connection. Test your Wi-Fi by trying to use another app that requires an internet connection. If your connection is unstable, try resetting your Wi-Fi router.

6. Reinstall the App Again:
Since you have already tried this, ensure you completely delete the app before reinstalling. Tap and hold the RCA Signal Finder app icon, select 'Remove App,' and then choose 'Delete App.' After deletion, reinstall it from the App Store.

7. Use a Workaround:
Some users suggest a workaround that involves using the app in different modes or with limited features. Check online forums or discussion threads for specific workarounds related to RCA Signal Finder crashes learn more - learn more - learn more.

8. Contact Support:
If the issue continues, consider reaching out to RCA customer support or check their troubleshooting guides online, as they may have additional solutions available learn more - learn more.

Following these steps should help diagnose and potentially resolve the crashing issue you're experiencing with the RCA Signal Finder app. If the problem persists, it may be related to the app's compatibility with your version of iOS.