Step1: In a channel, navigate to the message you want to edit, 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 Edit button, and press Enter.
Step5: You can now edit your message text or add emojis or attachments, for example. Once you’re done, press the Tab key until you hear “Send button, Done,” and press Enter.
Step6: To return the focus to the message, press Esc.