Today is my last day for my 7 day free trial, but no items appear when I click on Plans. This is the Adobe account that it takes me to when I click on the upper right account icon on InDesign.
If you can't find the cancel button to cancel your plan and the link shared by @Barb Binder is not helping you out then you will have to contact Adobe support for assistance in the matter. To contact support follow the instructions given below
1. Go to https://helpx.adobe.com/contact.html?rghtup=autoOpen
2. Wait a bit on the page that opens up, it should automatically open a chat popup. If that does not happen then look for a call out/chat icon at the bottom right, click over it and the chat popup should open
3. In order to talk to a human type "AGENT" in the chat box
4. If you are not able to get to the chat window, then disable your adblockers, firewall, enable cookies/scripts on your browser. If it still fails then change your browser/machine/network.
P.S. Be mindful of answering anyone who sends you a private message. See the following for more information about scammers