How to Disconnect Devices?

I am signed into the Mobile app and it says I have multiple devices connected to my WiFi that I do not recognize. I have been trying very hard for 2 months now to remove these devices. It only gives the options to add a person, pause the person (up to 2 hours) or unpause them, edit their name, edit their device type (from "desktop" to another device name such as "toy" or "doorbell"), test he device connection (troubleshoot device) and THAT'S IT!!! It says, (in device details) that if I want to "forget device", (WHICH I DO!) I'd have to disconnect it from my home network..................... HOW!!!!!!!!???????????? I have been ALL OVER THIS WEBSITE using my mobile app and even signing in to the account using my computer for 2 FREAKING MONTHS and there is absolutely NO OPTION anywhere!!! The chat option is far from helpful (gives ZERO ways to fix this and won't connect to a real person)  and there is absolutely NO WAY to speak to a LIVE PERSON on the phone. 

HOW CAN I DISCONNECT DEVICES??!!!! I'm trying not to be too frustrated here. Does anyone here know?

Thank you very much in advance!