MediaWiki:Explainconflict

Edit conflict: 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 version of the page (with your changes) is shown in the lower text area.

You will have to merge your changes into the existing text in the upper text area to incorporate your edits. 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.

Please do not just copy the text from the lower text area into the upper, unless you are sure that you want to undo all other changes made while you were editing this page. Rather, please try to compare the two versions and combine them into one text that preserves both your edits and any improvements made by others.

More information can be found in the help.