[Plugin:Post From Site] Login Error & Custom Fields!

Hello,i am using this awesome plugin but i got some problems.

1. I am using this plugin, i have added the shortcode to the page.
So i am connecting with my wordpress account,the form works correctly.
The problem is when i am connecting via wp social plugin,i have activate facebook & twitter,i am logged in but there is an error by the form “You are not logged in”.

2. I wanna make the form like that:
a)i need only title,tags: text field by the user not droplist & file upload.
b)Categories are disabled by me,it makes the post to the default category named as “Category1”,i wanna change it to “Category2”.

“I can donate for this!”