Instructions
Download a Diablo 2 trainer from a site that distributes available trainers, such as Nabou. These files will usually come in a zipped file format, such as ".zip" or ".rar."
Extract the files from the zipped folder when the download is complete.
Start your Diablo 2 game, then start your trainer. Do not start the trainer before you have started Diablo 2.
Manipulate the options in your trainer application's window to enhance your character; these options will vary depending on the trainer you have downloaded. The game should accept the changes you make in the trainer.