How do I delete RoboKiller?

There is an Apple article that explains how to cancel subscriptions. Click on the following link: If you want to cancel a subscription from Apple - Apple Support

To uninstall robokiller, see the following instructions:

https://support.robokiller.com/hc/en-us/articles/360027065591-How-can-I-disable-RoboKiller-on-my-iPhone-or-Android-device-

To delete the app, touch and hold the app, tap Remove app and then tap Delete App (or tap Edit Home Screen in the pop up menu, tap the minus sign, then tap Delete App)