The Twitter thing is a part of my theme, it is a widget area that you "drop" a WP twitter plugin to. My theme is what is called a "premium" theme, I bought it from Theme Forest, it cost $32. It has features the free themes don't.
The "read more" feature is not on the SEO plugin, it is a part of WP. If you look in you page or post admin panel, on the first row of buttons above your text you will see it, two rectangles with a gap, that is the page break button. I usually like to insert it right after a period, before the start of my next sentence.
May I suggest this? There are places to learn SEO and WordPress, a year ago, I didn't know how to do either. I learned both here. http://www.lynda.com it's a pay to learn site, with tutorial videos, $25 a month, not bad. You could also search for tutorials on line, there are many out there that are free. As for more on SEO, Google has a TON of info. If you don't have an account, get one and learn to use the web master tools.
This time last year, I was just starting with WP and SEO, now I have two WP blogs, one WP CMS, http://www.timage.com and one more coming soon. On Google I am on page one in the SERPs for some of the most searched terms in my industry locally. So, everything is possible, if I have done it, so can you!
Hope I have been of help.