Help me with HPL editor! please! it's error?or what is it?

[Acies]

Uhm.. You are accessing the wrong folder. Now I'm unsure of what you are asking for.
Option 1 (You want to place the decals in your map):
1. Click the Static objects icon (Pressing "6" on your keyboard)
2. Select "decals" in the scroll down menu
3. Select the decal you want and place it in your map

Option 2 (You want to edit the way a decal looks):
1. Open the .dds file located in textures/decals using photoshop/gimp
2. Edit the decal to your liking
3. Save as --> new name
4. Open MaterialEditor.exe (located in redist)
5. Create a .mat file (there is a guide for creating decals)