[mofeu]

Also can you explain me from where I have to make this step?

2. Add Adsense Client ID and Channel ID to your user profile fields
1. Add the following following new user profile field in AdminCP:
Type: Single-Line Text Box
Title: Google AdSense Client ID
Description: If you have an AdSense account, you can enter your client ID here. You then have a 50% chance that the AdSense ads displayed are credited to your account on threads you participate in. It should be in the form of <b>pub-xxxxxxxxxxxxxxxx</b>
Max length of allowed user input: 20
Display Size: 25
Field Required: No
Field Editable by User: Yes
Private Field: No
Field Searchable on Members List: No
Show on Members List: No

2. Add the following following new user profile field in AdminCP:
Type: Single-Line Text Box
Title: Google AdSense Channel ID
Description: If you choose to enter your AdSense client ID, you can specify a channel ID as well.<br /><br />It would be a good idea to have a unique channel ID for this forum (then you can track stats specifically for the forum).<br />
Max length of allowed user input: 10
Display Size: 25
Field Required: No
Field Editable by User: Yes
Private Field: No
Field Searchable on Members List: No
Show on Members List: No