I'm very sorry you feel that way.

Unfortunately "I can't add statements to an item or a property" is not a description of an issue anybody can help you with. https://www.mediawiki.org/wiki/How_to_report_a_bug might give guidance how to ask for help.

The other issue you mentioned contains an actual PHP error message saying "Constant WB_NS_PROPERTY_TALK already defined in LocalSettings.php". You should check where this constant is defined a second time. Usually you do not need the "define( … )" lines and can rely on the defaults that come with the Wikibase extension, so it might help to simply remove these lines from your LocalSettings.php.

I hope that helps at least a little bit.