MyBB Community Forums

I need the sidebar Like to search threads and new posts and stuff like that were can I download?

You have this one:
http://mods.mybboard.net/view/side-boxes-21

There's some others as well. I know MyBBCentral have a great one, but you have to pay for Labrocca's plugins.

Also you could always just use the search form Click here to view results

http://mods.mybboard.net/view/sidebox

Personally the MyBB Central one has been working the best for my preview forums but if you don't have a subscription you can use the free one that darkly pointed out.