Why Is My Blog Stripped Down with NO Features or Tags??

hi guys! 

I did some reading... you know how in THIS particular blog, you can edit HTML, add bold, add H1 to h6 tags...

Well in my blog... it's all gone!!! How do i return these features? I want to allow embedding of video and even paypal buynow buttons in the blog posts!

And ofcourse... i gotta have the html tag features enabled! including <style>

lemme know! Thanks!