Hi there! You can change which page WordPress shows on your home page by going to your dashboard (i.e. log in) and then go to Settings > Reading.
You will then be able to choose which page to show – you can either have your latest blog posts, or a static page (which you would need to create first) for both your home page and your blog’s posts page.
I went there, tried to change the URL and now I have an internal server error, and I cannot access at all to WP.
In that case it sounds like there’s something wrong with either your theme or a plugin. If you rename your plugins folder to, perhaps _plugins (which will then deactivate all plugins) and then try and reload. That should then get you back in to your admin. In which case, switch to the 2013 or 2014 theme. And test that the home page is the one set in settings>reading.
Then you’ll need to try and diagnose whether it was a plugin (by renaming the _plugins folder back to plugins) and then activating the plugins one by one. If it isn’t a plugin issue (i.e. you re-enable all the plugins you had and you still get the correct page showing on the home page) then it is likely to be your theme.
In that case, let us know which theme you are using. If it was a plugin, let us know and we can see if we can help there.
Thanks, I was just starting and had nothing important, so I decided to reinstall wp. 🙂
