MediaWiki:Explainconflict

Someone else has changed this page since you started editing it, resulting in an edit conflict. The upper text area contains the page text as it currently exists. (Without your changes) Your versionof the page (with your changes) are shown in the lower text area. You will have to merge your changes into the existing text. Only the text in the upper text area will be saved when you press ""; all other changes in the lower text area will be lost.

For additional information on edit conflicts, see Help:Edit conflict.