Seriously, you’re asking for somebody to do the work for you on seven logos? Wouldn’t it be much more useful (and much more likely that you’ll get a reply) if you asked for guidance in how to remove the backgrounds yourself? Then you’ll know for future use.
What is it you want to do, exactly? It sounds to me as if you want to make the white background transparent. Is that correct? And what software are you using?
If you’re using photoshop or gimp, probably the background color will be in its own layer. Simply hide the layer (clicking on the eye icon beside it) and save the image… in a format that allows transparency, such as the png format that you’re using now
And I’m trying to explain that asking people to do it for you - especially for so many logos - might well be seen as rather cheeky, and is unlikely to get you any response. On the other hand, if you can explain what software you’re using and why you found it difficult to do, we could help you learn to do it correctly.
I agreed with the statement of adpp505050. If you make these logos by yourself than you should know how to change the background too. If you still need help than you have go to follow the logo design tutorials.