Change 3 Things about My Wordpress Site / Thrive Content

My Wordpress site, [login to view URL] has 3 issues that I'd like to have you help change: 1) I would like for the the social media button to share on Facebook the images associated with the individual blog post, rather than the same image every time--a photo of a sunset. 2) I would like for the Twitter social media share button to be corrected so that "@ @finleyt" isn't shared each time. One "@" is enough. 3) I would like for the images associated with the blog posts on the main page to automatically be small, such as the smaller images here --> [login to view URL]