Article: Click or double-click the Slack app icon, which resembles a "#" sign on a white background, on your computer. This will open your main Slack group if you're logged in.  If you aren't logged in, enter the name of your Slack channel, your email address, and your login password before proceeding. You can also open Slack on your computer by going to https://www.slack.com/ in your computer's web browser. On the left side of the window, click the name of the channel that you want to delete. It's a gear-shaped icon at the top of the window. Clicking it prompts a drop-down menu. This option is in the drop-down menu. It's at the bottom of the window. You'll find it near the middle of the page. It's on the right side of the page. Doing so will remove the channel from your Slack group.
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Open Slack. Select a channel. Click the "Settings"  icon. Click Additional options …. Click Delete this channel. Check the "Yes, permanently delete this channel" box. Click Delete Channel.