ferry.dae color editing?

I wanna edit the material colors on the ferry.dae model, but I basically opened the map editor 30 minutes ago, and have ZERO idea of what I'm doing. Could anyone help? Also a tip on how to remove the "no texture" would help.
--- Post updated ---
PS: sorry I didn't just screenshot it, but I did not have the willpower to, and my phone was right there. ¯⁠\⁠_⁠(⁠ツ⁠)⁠_⁠/⁠¯

 

edit colours on texture

 

Like this? Or do you mean editing the file itself?

 

the texture file