When I try to acces in www.mywebsite.com/coppermine/install.php apears this message:
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The 'include' directory (located in the directory where you uploaded Coppermine) should be writable in order to save your configuration. Use your FTP program to change its mode to 777.
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The 'albums' directory (located in the directory where you uploaded Coppermine) should be writable in order to allow pictures upload. Use your FTP program to change its mode to 777.
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The 'userpics' directory (located in the 'albums' directory on your server) should be writable in order to allow pictures upload. Use your FTP program to change its mode to 777.
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The 'edit' directory (located in the 'albums' directory on your server) should be writable in order to allow pictures upload. Use your FTP program to change its mode to 777.
Once you are done, hit the "Try again" button.
How can I change to mode 777?
RTFM: http://coppermine-gallery.net/demo/cpg14x/docs/index.htm#permissions