Then you have to load the texture with the mesh.
Read this: Tutorial for the Object Maker
To use the Object Maker, start the Game, click on Settings, then on Object Maker.
At first a new Screen will show up.
The first Tab is "Object"
To add your own Mesh, you won't need that really, except if you want to test your arranged Meshes and see how they would look in the Game. Then click on "Test" and you will be at the scene with a Lion to Test the Meshes.
Now to add your own/new Mesh.
Klick on "Mesh".
Then you will have a new tab.
In the Line "Mesh" you write the exact name of your Mesh. Dont forget to write everytime the .mesh behind it.
Under that you will insert the Material. It has to be exact named too. If you wrote anything wrong, your Mesh won't be found, or it will be show up pure white. The easiest thing is just to insert the meshname.mesh and then click "add new", it will automaticly set the material to the mesh.