To compile all open files, click on the "Compile" button. If you want to just compile a specific file, right click on its name on the left listing of files, and select Compile Current Document. Once the compile is completed, the results are displayed on the Compiler Output tab at the bottom of the screen. If there are no errors, you will see "Last compilation completed successfully". If there are errors, they will be listed. If both errors and warnings are found, the number of each is listed, and errors will be listed before warnings. If you click on an error, it will highlight the place in your source code where the error is. Use the up and down arrow buttons to navigate between error messages.