2 Apr 16, 2010 03:46
for your #1 question, comments can be modified by just adding html tags just like <b> BOLD TEXT</b>
for images just <img src="http://" alt="" title="" />
for NEW POST, if a user is authorized to write a post, he/she suppose to see a WRITE at the very top of the screen the b2evolution TOOLBAR. You know where you can see toolbars like B2evolution, Dashboard, See, Write etc.,,
For your number2 question. Yes there is a website for plugins by category.