go to config.php and set to false the profiler. 

http://notonlyphotos.com//sign-in
page works

done thanks

Can you help me to restore ftp plugin for updates without using FileZilla but directly from the keypad for system administrators?

You need to use the same details you used for uploading the software. 

Should I create a ftp credentials when I loaded the software?

Yes, you should have had the access attributes before. 

configuration software: localhost my ftp is ftp.notonlyphotos.com what should I do to change?

Probably these are not the details you used while uploading the software. Contact your hosting provider to find out the right access details

ok