Hi, hmm... but if you can not login to Joomla back-end - this is not our fault. We made only template not Joomla. Probably you: 1) forget your password 2) somebody hacked your page
You forgot about Joomla updates ? Now you see why.
If you have access to FTP, you can hire me or somebody else to recover access to admin back-end.
If you have access to FTP you can upload your logo here: images/logo.png - this file is missing.