Step by step: 1. Open the map file located in the game folder / Maps using an archiver. 2. Drag the text document to your Desktop. 3. Rename the text document, for example, to 'msg'. 4. Enter your text into it. 5. Place the file back into the map archive. Now, to display this message in the game, you need to enter the following code: MessageBox("/Maps/SingleMissions/--your map name--/--text document name--"); If you enter this code without the function, the message will be displayed at the beginning of the game.