Post on Slack
On the bottom of your screen is the place for you to write and post messages. To send a message, you simply click on that channel or direct message recipient and then use the messaging space at the bottom of the screen.
Type your message.
You have the usual formatting options- bold, italics, adding a hyper link, numbering and bulleting. You have a paper clip icon; use it to add documents or files with the post.
Alert people
There is an @sign you use to alert people. Use that to mention a specific person’s name and the system will instantly send her a notification. So, if you want someone to do something or respond or you are responding to someone, click on or enter the @. A list of workspace members pops up and you can pick the names of the people you want to alert to this message.
This is critical for letting people know you want them to do something or pay attention to your post. If you choose @channel,you are choosing to notify everyone who is in that channel that there is something you want them to read. Everyone in the channel gets that notification whether they are currently in the Slack or not. If not, they get the notification when they log in.
The @here works a little differently. If you have a very time sensitive message that you want everyone who is currently on slack and in that channel to act on, you can choose @here and the system notifies only the people then on Slack and in that channel.
Finally, you also have the emoji icon. On Slack, you can use emojis for all the normal reasons, expressing how you feel about something. They are useful for giving Thumbs up or Thumbs down quick votes.
Please note: when you hit the enter key on your keyboard you are sending your message. You can add more lines and then hit enter and that will automatically be added to your message. To create a new line without sending the message, hold down the Ctrl key while pressing the enter key.
You can edit a message that you have sent by immediately pressing the up-arrow in the empty message space.