Uploading Logo Help

I have gotten my site almost where I want it but cannot change the logo in the header. It’s a StudioPress Agency theme and I can get into ftp but cannot change the .png. I can’t even change the wording in the header, I downloaded FileZilla but it gives me a blank server page…real newbie here and trying to get my site up and this is the last task. Any suggestions??? site is www.chesinc1.dreamhosters.com (till it goes live) Thanks!!

To change the wording in the header, you need to open the admin panel and change it in the settings.
If your theme is reasonably sophisticated, you should be able to specify a logo in its settings tab as well. Otherwise you’ll need to edit the theme manually to include it.