Markers on the Map, Guide to Placing
You can create markers on the interactive map by using specially labelled signs.
To use these, the first line of the sign MUST be [dynmap].
After that, any non-blank line will be included in the label of the marker, except for lines formatted as
set:<markerset-id> (which allows the marker to be added to a specific marker set) or
icon:<icon-id> (which allows the marker to be set to use a specific icon - if not specified, the icon sign is used).
If the marker is successfully created, the sign's text will erase the [dynmap], set: and icon: lines. If the sign is later deleted, the corresponding map marker is deleted.
To edit your marker in the future, just break the sign and place a new one.
Here are a list of icons you can use: File:Https://camo.githubusercontent.com/9db598a2984ee843180041450e7292f284208624/687474703a2f2f6d696b657072696d6d2e636f6d2f696d616765732f4d61726b6572732e706e67