+<i>* how to [upload](help/FAQ#upload) files</i>
+
+Those icons can change with themes. Some examples:
+
+<table>
+<tr>
+ <td>Darkbubble: </td>
+ <td><img src="doc/img/editor_darkbubble.png" alt="darkbubble.png" style="vertical-align:middle;"></td>
+ <td><i>(inkl. smoothly, testbubble)</i></td>
+</tr>
+<tr>
+ <td>Frost: </td>
+ <td><img src="doc/img/editor_frost.png" alt="frost.png" style="vertical-align:middle;"> </td>
+ <td> </td>
+</tr>
+<tr>
+ <td>Vier: </td>
+ <td><img src="doc/img/editor_vier.png" alt="vier.png" style="vertical-align:middle;"></td>
+ <td><i>(inkl. dispy)</i></td>
+</tr>
+</table>
+<p style="clear:both;"> </p>
+<p style="clear:both;"> </p>
+
+**<img src="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.
+
+<figure>
+<img src="doc/img/acl_win.png" alt="Permission settings window">
+<figcaption>Permission settings window with some contact selected</figcaption>
+</figure>
+
+Click on "show" under contact name to hide the post to everyone but selected.
+
+Click on "Visible to everybody" to make the post public again.
+
+If you have defined some groups, you can check "show" for groups also. All contact in that group will see the post.
+If you want to hide the post to one contact of a group selected for "show", click "don't show" under contact name.
+
+Click again on "show" or "don't show" to switch it off.
+
+You can search for contacts or groups with the search box.
+
+See also [Group and Privacy](help/Groups-and-Privacy)
+
+