How to write (×) Multiplication sign in editor?

Click Start > All Programs > Accessories > System Tools > Charcter Map. In the font list click "Wingdings". There are two crosses on the third row.
Click the × symbol then click "Select" and finally "Copy"
Thats it, Now paste it where you want to type it.

Shortcut Method :

1 .Press Windows key + R
2. Type "charmap"

Enjoy Symboling........
 

How do I put AdSense after my individual blog posts?

1. Get the ad-code, and copy into your clipboard. (The AdSense help page for this is here.)
2. In the Blogger editor, write the contents of the post.
3. In Options (under Post Settings in the bar on the right of the Post Editor), check that "Use
4. tags" is chosen for the Line Breaks setting.
5. Go to the place where you want to put the ad. Put in some "marker text" (a word that isn't used the post, eg "XXX" ).

1. Align the marker text the way you want the ad aligned (eg centered).
2. Choose the "HTML" tab, and go to the marker-text.
3. Replace the marker-text with the ad-text from step 1 (ie paste it in)
4. If necessary, put line-breaks (
5. ) before or after the ad.
6. Publish the post, and check that it looks the way you meant it to.