1. Found the channel that originally chose to subscribe to the company's service. I clicked on a link on the webpage, received a marketing email from the company, and chose to subscribe.

2. On the corresponding subscription channel, find the option to unsubscribe or unsubscribe from the service. This is a link or button that says "unsubscribe", "unsubscribe" or something like that.

3. Click the corresponding option and follow the page or system prompts to complete the operation.