If you want only the image column from the second table then you can use subquery to that.
Check this query-
SELECT n.newsid, n.state, n.district, n.region, n.views, n.currentplace, n.newstitle, n.description, n.poston, n.postby, (SELECT TOP 1 imagepath FROM tbl_userpost_newsimages ni WHERE n.newsid=ni.newsid) AS imagepath
FROM tbl_userpost_news n
Order By n.poston desc
Note: I have removed
ni.newsid from select list as
n.newsid is already there and suppose to return the same value.
Hope, it helps :)