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1: How do you quote twice in a reply?
Just use the Instant UBB code to the left of the reply box. Click on "quote", you'll get a {quote}{/quote} in the reply box, copy what you want to quote in between them. You can do this as many times as you like, writing responses after each.
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4. How do you include a site and just write "here" and when you click on it it goes to that webpage?
Again use Instant UBB code. Click on URL, you'll get a box saying enter the address. Then click okay, you'll get another box where you can put what you words you want people to be able to click on to access the site, eg "here".
Looks like you've got your other questions down