You need to left click on an equipped item (does not work from the inventory) with a charm quality listed in the stats, and also need to know the Enchant Weapon skill. Don't right click first, as that will activate your current secondary skill.
If that is what you are doing, the charm window may be opening off screen. This can be caused by using an exploit that the
patch fixed (the DVD version is already updated, as are most re-release CD versions), or by opening a charm window near the edge of the screen and later reducing the game resolution.
Run the configuration program and increase the resolution, start the game, open a charm window, move it into the center of the screen and close it. Quit, run the configuration program again and restore the original resolution; now when you re-start, they should open on screen.
If you are already playing at 1024x768 in the CD/DVD version, you can edit the
config.div file (in Notepad or another text editor) to temporarily play at a higher resolution, such as 1280x1024. Note: with the disk versions, the game itself may be fine at higher than supported resolutions, but opening the auto-map can cause the game to crash (the downloadable version can use any resolution supported by your system).
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