To edit or create content, view the content repository or perform any administrative functions you must first log in to Weceem.
You can do this by browsing to <yourserver-url>/admin if you are using the standalone Weceem WAR. Here you will be prompted for your user name and password. By default new installations have a single "admin" account with password "admin". You must change this password, and you can do so in the Administration section.
Normally this will be a case of browsing to <yourserver-url>/admin but your application may have configured weceem to use a different URL mappings such as /wcm/admin. You need to look at your application's configuration if /admin does not work for you.