Newbie Help 2.0

Thank you for this amazing answer, that was very helpfull !

Now I have problem with the textbox (Iwouldn't say problem but, it just look like it doesnt belong there),

4)How can I modify this textbox ?

5)How can I edit the thread icons ?, and how can I find icons suitable, as you can see it just doesn't fit the theme.

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Anyone can Help me on this subject ?