Step 1 - Don't use blender
Step 2 - Get Milkshape 3D
Don't listen to them.
Blender is free, Milkshape costs $35
If you want to recolor creations on blender, do this.
1.- Open your model in blender
2.-go down to the left part of the menu panels(link and materials)
3.-Click on New under Material
4.-click the colored square and select your color
5.-click on any polygons you have and click under Material assign.
6.-repeat steps 3-5 if need be.
And kid, as suggestion, if you are going to use the original sword script, then make sure to change the sounds and slow down the fire rate.