That's the suggestion link - it's in the feedback section.
If you want to quote someone, it's very simple. At the bottom of their post, you should see 3 boxes - Edit, Multi, and Quote. If you click on quote, it will start a new reply for you that contains that person's entire post. You can edit it if want to - I'll sometimes delete everything but the one line or paragraph I want to respond to.
If you want to quote multiple people, click on the Multi button for each person you want to quote - it will turn red. When you've selected them all, click on Add Reply, and all of those posts will be quoted in your reply. In both of the above cases, it will give you the person that made the original statement.
I'm not sure about the pictures - I've posted images, but not the way they sometimes appear for people. I'd have to play around with that.
If you have other specific questions, ask them here. We have a site orientation and FAQ section, and maybe I can check with admin about adding a topic that uses some of the specific questions you ask. I'm sure you're not the only person who's wondered these things!