Thanks, but "as normal" appears not to work. The "Sigma" icon does not show next to the YouTube icon on the menu so I cannot initialize LateX. If I try to enter LateX code without using the convenience of the drop down menu, when I hit "preview", I don't see what I put in. Instead, I see the last stuff I put in when I helped someone with homework. It seems that the LateX icon is turned on for some classes of threads such as homework help but not others such as this one or the blogs. Am I missing something? Please advise. Thanks.
Thank you all for you comments and suggestions. I feel uneasy posting LateX code without the benefit of preview. I think I will create the LateX where preview is available and then just cut and paste into the blog.