Hello, I'm not seeing where to set the featured image for a blog post. I want my blog post page to show the thumbnails of featured images, but in each post there doesn't seem to be a place to do this? Am I missing something? It's showing images of old posts of mine as featured, but I can't see where to change them.

Additionally, is there a way to change what's shown in the Title of a page? It only shows >>Page Title. I would like it to show MY WEBSITE TITLE >> PAGE TITLE. Thanks!