Nios II evaluation KIt, how to write to the LCD

I assume your talking about the Nios II Embedded Evaluation Kit, Cyclone III Edition.

The "Evaluation," as far as I know, just means that the kit only includes an eval version of Nios II. This just means if you want to design a commercial product and sell it you will have to purchase a Nios II license for around $500. You can still load your own designs and code to the board, but if your design uses a Nios II core, I believe you will need to keep the kit connected to your computer through the USB cable.

As for your second question. You can use the LCD. There is an example system that is included with the kit called "application_selector." This is what runs when you first power up the board to select between different demo applications. It uses the touchscreen as well. This example includes the SOPC builder system and the corresponding code to run the application selector. If you want to learn how to use the LCD I would make love to this example inside and out. The example uses the free video_sync_generator core along with a dma engine and fifo to 'talk' to the display, and the software includes a free small graphics library that you can use to generate your own simple graphics with your own code.