Step1: In a channel, navigate to the message you want to delete, and press Enter.
Step2: Press Enter again to open the message menu. You hear: “Like.”
Step3: Press the Tab key once. You hear: “More options.” Press Enter to select.
Step4: Press the Down arrow key until you reach the Delete button, and press Enter. The message is deleted.
Step5: To return the focus to the message list, press Esc.