Problems after changing domain name

Hello

I created a “free” site and I changed twice the domain name. After that I have the following problems:

I can not revert back the original name of the site (domain)
When I save the site it shows the first name (domain name)

The above mentioned problems, I think, created two more problems

The blog page in the site does not work any more
When I create a page as an external link (it opens in the same window) in order to go back in the site I have to press three (3) times the back page. Please note that I have change 3 times the name of my site.

Is something that I can do to overcome that problems?

Thank you

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