Hello ReNoStar,

I have checked your twitter application and it seems like you missed 1 setting which gives EasyBlog permission to write in Twitter. However, when I try to enable this, I got this error:

You must add your mobile phone to your Twitter profile before granting your application write capabilities. Please read https://support.twitter.com/articles/110250-adding-your-mobile-number-to-your-account-via-web for more information

Can you please your mobile number and you also can try configure this by yourself here and checked the Read and Write:http://screencast.com/t/NG7AoqPzRuQ . After that, revoke EasyBlog access and authenticate it back: http://screencast.com/t/TIJKAsIobkW . If this doesn't resolve your issue, please do tell us and we will assist you configuring this.

Hope this will help.
Thanks.