1. First open the group chat page and click the icon in the upper right corner. As shown in figure 1.

2, and then choose to click on the group announcement. As shown in fig. 2

If you are a group owner, you can edit the contents of the group announcement here! But ordinary group members cannot be edited, and only the group owner has permission. As shown in fig. 3

4. Click Finish after editing, and you will be prompted "This announcement will inform all group members. Do you want to publish it? " , click Publish to publish! As shown in fig. 4

At this time, you can see what you just published in the group announcement. As shown in fig. 5

6, and will also be in the chat window @ everyone! As shown in fig. 6