The icons under the text area are there to help you to write posts quickly:
<imgsrc="doc/img/camera.png"width="32"height="32"alt="editor"align="left"style="padding-bottom: 20px;"> Upload a picture from your computer. The image will be uploaded and correct bbcode tag will be added to your post.
<imgsrc="doc/img/paper_clip.png"width="32"height="32"alt="paper_clip"align="left"> Add files from your computer. Same as picture, but for generic attachment to the post.
<imgsrc="doc/img/chain.png"width="32"height="32"alt="chain"align="left"> Add a web address (url). Enter an url and Friendica will add to your post a link to the url and an excerpt from the web site, if possible
<imgsrc="doc/img/video.png"width="32"height="32"alt="video"align="left"> Add a video. Enter the url to a video (ogg) or to a video page on youtube or vimeo, and it will be embedded in your post
<imgsrc="doc/img/globe.png"width="32"height="32"alt="globe"align="left"> Set your geographic location. This location will be added into a Google Maps search. That's why a note like "New York" or "10004" is already enough.
**<imgsrc="doc/img/lock.png"width="32"height="32"alt="lock icon"style="vertical-align:middle;"> The lock**
The last button, the Lock, is the most important feature in Friendica. If the lock is open, your post will be public, and will shows up on your profile page when strangers visit it.
Click on it and the *Permission settings* window (aka "*Access Control Selector*" or "*ACL Selector*") pops up. There you can select who can see the post.
By default, rich editor is disabled. You can enable it from Settings -> [Aditional features](settings/features) page, turn on Richtext Editor and click "Submit".