Im sorry i have no intentions of sabotaging this post, but i think ive seen your other post earlier making same request.
And as ive told you earlier, the logo is already on a transparent background.
You can see in the below screenshot ive placed your logo on a darker background on the right side and i can see the logo is already transparent and the background below is very well visible.
Maybe you are exporting it as a jpg, Try exporting it as a png.
[File -> Save for web -> select PNG-24 from top right menu -> save]
Or im missing something here?, could you please explain more about it, which background you are talking about.