How to remove advertise on a sub-page ?

I don't want any ads on my sub-page , how can i do that ?

Sign in to Campaign Manager.
Click the correct account name.
Near the top right of the account page, click the Settings icon next to the account name and select Manage access from the dropdown.

Sign in to your AdSense account.
Click Ads. Overview.
In the table of all your sites, click. next to your site.
In the "Page exclusions" section, click Manage.
In the list of page exclusions, find the exclusion you want to remove.
Click More. Remove.

Search for the tutorial on the YouTube.

Sign in to your AdSense account.
Click Ads. Overview.
In the table of all your sites, click. next to your site.
In the "Page exclusions" section, click Manage.
In the list of page exclusions, find the exclusion you want to remove.
Click More. Remove.
Click Apply to site.