具体操作步骤如下：
微信群
1、首先点击“微信”。
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2、然后点击自己创建的群。（注意：只有群主才能够在微信群里@所有人）
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3、点击右侧编辑“群公告”。
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4、接着编辑群公告，点击发布。
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5、最后点击“确定”。
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QQ群
1、艾特所有人，需要有权限，这个权限需要是某一个群的管理员或者是群主，这样才可以，其他的只有单个艾特，那么先进入到群当中。
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2、找到你想要发信息的群组，双击该群之后，进入到群中的聊天界面。
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3、在聊天界面中输入@，这个时候会弹出一个下拉菜单。最上方的内容就显示为全体成员，后面显示着你可以@全体成员的次数。
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4、点击之后，就会看到聊天界面中的字体变成了蓝色，这就代表了你已经成功的@了所有人，这时候你说的话所有的人都会有系统提示，即便它屏蔽了群消息。
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5、输入完内容之后，点击回车键，发出去，这时候别人就能够得到系统提示了。
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