This guide is for Android. I’ll be demonstrating on a Samsung phone.
Download the “Kustom” app: https://play.google.com/store/apps/details?id=org.kustom.widget
Once installed, follow the guide in the video below. This is the link for the image: https://rigreference.com/solar/img/wide
Pressing the circle will allow you to edit the widget. Pressing the image will refresh it.
Any issues, happy for you to contact me on twitter.