You can highlight the text you want to quote and then press Control-C to copy it. Then, in your post, press the quote button and then press Control-V to paste.
To highlight text without a mouse, double-tap on the first word you want to highlight and then use Shift-Arrow key to stretch the highlight over the text you want to copy. If you triple-tap a whole paragraph will be highlighted. (This will usually work on any text displayed on your screen. It doesn't have to be in an edit box.)
If you are not using a mouse (which most times I am not) the keyboard shortcuts to remember are:
Control-Z = Undo most recent edit
Control-X = Copy and delete highlighted text
Control-C = Copy highlighted text
Control-V = Paste copied text
With a mouse these same edits can be done with a Right-Click to bring up a context menu.
To insert a link with a word or phrase, highlight the word or phrase you want to become a link. Then press the "Insert URL" button at the top of the edit box. For example, if I want to associate a URL with the word "here," I highlight "here", press the "Insert URL" button and a pair of brackets will appear around the word. It will look like this: {url}here{/url}. Only it will have the square brackets. I used the curly ones to show you.
Next, add an equal sign like this: {url=}here{/url} Then, after the equal sign paste in your URL address like so:
When you preview or submit your post it will show like this:
here
I hope that answers to what you were asking.
Bobcat