How Do I use Tiled GGD?

[Barack Obama]

This one?
https://www.romhacking.net/utilities/646/

There is also a version by puggsoy which fixes Endian mixup:
https://wiki.vg-resource.com/TiledGGD

Here is a tutorial by Mechanicalsaviour for SWRZ2:

1. Set the width of the sheet to 512 pixels(use the arrow keys for this)
2. Set the image skip size(image>skip size) to (height) row of pixels.
3. Set the image format to 8bit per pixel.(Image>Format>8bit per pixel)
4. Set the image to tiled mode(Image>Mode>Tiled)
5. Set tile size to 16x8 pixels.(Image>Tile Size)
6. Set the palette to 4 bytes per color(everything else in the palette is default, BGR colors)
7. Search sprite location with Pgup and Pgdn keys.
8.The palette is located below the respective sprite set. If many sprite sheets are located together, their palettes are probably at the end of that set. To get close to the location of the palette, search its offset location with the image viewer and then input the location in the "Go to offset" option of the palette. Search in that sector with 'home' and 'end' keys using an skip size of 256 colors for fast searching and16 colors for precise searching. Finding the palette is tricky and requires practice though.

It's probably different for each game (width, bit, tile size, palette, etc.), but it should give you an idea how this tool works.

An alternative and easier to use tool would be PSX-VRAM:

PsxVram-DotNet
https://github.com/romhack/PsxVram-DotNet
note: latest version of PSX-VRAM

PSX VRAM Viewer (updated) v.3.0
https://www.romhacking.net/utilities/1567/
PsxVram-SDL (discontinued)
https://github.com/romhack/PsxVram-SDL
note: both are probably identical, updated support for more emulator savestates

PSX VRAM Viewer hacked for NO$PSX v.2
https://www.romhacking.net/utilities/1324/
note: oldest version just with support for nopsx instead of espxe

Psx V-Ram v.1.1
https://www.romhacking.net/utilities/442/
note: the oldest version, only supports epsxe

PSX-VRAM Tutorial:
https://wiki.vg-resource.com/PSX-vram
note: pretty easy and straightforward tutorial