The map editor will appear in the list there. To open the Stronghold Crusader 2 Map Editor, open your Steam client, click on Library and then Tools from the dropdown list. In particular, the Landscape section contains information that will save a lot of trial and error when testing out your maps. It is worth looking through before you begin creating maps as it will help you avoid common pitfalls people encounter. This guide is intended as an introduction to the basics of making maps with the Stronghold Crusader 2 Map Editor.