How to put Adsense code on my blog?

You can do it yourself but rookies find it easier with a plugin:
https://www.acmetech.com/blog/2005/07/26/adsense-deluxe-wordpress-plugin/

If doing it yourself in a post or page, make sure the wysiwyg editor is off. If you’re putting it in your sidebar, you’ll need to follow your theme’s structure with wrapping <div>‘s or <li> and <ul>‘s.

Can you give more details please.I am new to wordpress so…sorry.

I’m a newbie also but the plugin recommended by samboll is very easy to work with if you’ll take the time to read the installation.

excerpt from their site
Installation:
? Installed like most all WordPress plugins, just copy the adsense-deluxe.php file into wp-content/plugins
? See the ReadMe.txt file included with the download (before you email me for support!).

Install this plugin: https://www.acmetech.com/blog/2005/07/26/adsense-deluxe-wordpress-plugin/
Do you know hwo to install a plugin?

I installed it but now I get this message at my admin area:
Warning: Cannot modify header information – headers already sent by (output started at /home/klajdi2/public_html/blog/wp-content/plugins/adsense-deluxe.php:1123) in /home/klajdi2/public_html/blog/wp-login.php on line 12

Warning: Cannot modify header information – headers already sent by (output started at /home/klajdi2/public_html/blog/wp-content/plugins/adsense-deluxe.php:1123) in /home/klajdi2/public_html/blog/wp-includes/pluggable.php on line 313

Warning: Cannot modify header information – headers already sent by (output started at /home/klajdi2/public_html/blog/wp-content/plugins/adsense-deluxe.php:1123) in /home/klajdi2/public_html/blog/wp-includes/pluggable.php on line 314

Warning: Cannot modify header information – headers already sent by (output started at /home/klajdi2/public_html/blog/wp-content/plugins/adsense-deluxe.php:1123) in /home/klajdi2/public_html/blog/wp-includes/pluggable.php on line 275

I can’t even log in!What is wrong and how to fix it?