so i want a texture trail but its always white and an image i dont know how to quit the background

I think what you're asking is how to make the other stuff/backround transparent?
What program are you using to make the trail texture?

Yeah you need to make it transparent, heres a u tutorial for you

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if you dont have gimp there is a link in that videos description to download it.

To make a texture's background transparent you need to add an alpha channel to it and erase all parts that you want to appear clear.

Its better to set an image to have a transparent background when starting from scratch so you won't have to edit it a bunch later on to fix it.

And also only specific formats that support transparancy. For example like .png and .gif.

That's answered.

Closing, pm me if you actually meant something different.