You will still need to read through the Moving WordPres instructions. The issue is that it appears you have not changed your WordPress URL and Blog URL before pointing to the new domain. There is a fix for this on the instruction page.
We understand that you may not be an expert and it's okay.
"It is important that you set the URI locations BEFORE you move the files.
Suppose you accidentally moved the files before you changed the URIs: you have two options.
OPTION 1. Suppose the files were originally in /path/to/old/ and you moved them to /path/to/new before changing the URIs. The way to fix this would be to make /path/to/old/ a symlink (for Windows users, "symlink" is equivalent to "shortcut") to /path/to/new/, i.e.
ln -s /path/to/new /path/to/old
and then follow the steps above as normal. Afterwards delete the symlink if you want.
OPTION 2.If you forget to change the WordPress Address and Blog Address, you will be unable to change it using the wordpress interface. However, you can fix it if you have access to the database. Go to the database of your blog and find the wp_options table. This table stores all the options that you can set in the interface. The WordPress Address and Blog Address are stored as siteurl and home (the option_name field). All you have to do is change the option_value field to the correct URL for the records with option_name=’siteurl‘ or option_name=’home‘.
You're done. Test your site to make sure that it works right. If the change involves a new address for your blog, make sure you let people know the new address, and consider adding some redirection instructions in your .htaccess file to guide visitors to the new location."
All of this information and more is available through the link above.