You may want to double check that you are using the Genesis Featured Posts widget (and not Pages)….and make sure you are placing it inside of the Home Featured Posts widget section. This section is designed for Featured Posts and the css will automatically adjust the posts to float next to each other. If you’ve done this and its not working then you’ll have to post a link so we can take a look.
For the second question you’ll need to create a separate thread since we have a “One Question per thread policy“……it helps us keep the threads organized and on topic, which makes it easy to search for issues/solutions, etc.
I create awesome sites for awesome people! Contact me if interested – email@example.com