Drupal 7.x

I saw a question similar to this, but it didn't solve my problem.

Using the latest version of drupal7.

I am a newbie to both drupal and html, so please bear with me on this.

I want to allow users to post youtube video's in the forum using the embed code from youtube.

I know I can do this by allowing full html, but I don't want all users to have that option.

I also read that I can add the iframe tag to the input field. My question is: where exactly is that?

I use the module "Automatic Nodetitles" to use a date-field as node title (via token). But the provided token uses the full format of the date/time, so i want to short that. How can i do that? Can i use a token with a formatter? Or do i have to execute PHP?
Any suggestions?

I have created a view with a block and I have placed the block in the content section of my theme. I have the block set to appear on a single node and I would like to be able to center the block on that node. I would also like to make the block more visually appealing by maybe setting borders around it or making the content of the block which is always going to be text scroll. What I am trying to do is recreate something like the breaking news section on this wordpress page. http://www.scouttroop591.org/

I have an odd problem. I installed CorporateClean theme and then upgraded it to the latest version. After upgrading it, I tried to make some changes to the text in the main page and slideshow. No matter what I do, nothing changes. So I made another theme the default and deleted the Corporateclean and cleared the cache.
1. It still shows in the appearance area as "Disabled"
2. When I try to re-install it, Drupal tells me it is already installed.

I've been building a site that seems the admin pages are taking quite a bit of time to load because of so many extra queries on each one. Is there a way I can block that while I'm not live since I really don't need it right now? It would really speed up my process and help me get this out a lot faster. Some of the admin pages have taken over two minutes to load and I open a ton at a time too so I know that doesn't help.