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As an Administrator, WordPress allows you to use the User Roles section to set the permissions and access of the user . You can access it from your Dashboard by clicking on Users > User Roles: 
In the User Roles section, you can create Role and determine which admin pages can be viewed and modified by each Role . 
Note that you must know which pages can be accessed or modified with the Access and Modify permissions. 
You have five pre-defined User Roles in your default WordPress installation – Administrator and Editor and Author and Contributor and Subscriber. While the Administrator Role has all the permissions . You can not delete Administrator. Click on the Action button for one of the User Roles to see the permission fields.
The Edit User Roles section gives you one field – Permission, the Administrator User Roles has all the permissions. However.
<h3>Additional Documentation</h3>
I am ready to answer on your questions about plugin usage. Use <a href="https://plus.google.com/+ehababdo" rel="nofollow ugc">google+</a> for that.

User Roles

I am ready to answer on your questions about plugin

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User Roles WordPress plugin makes user roles and capabilities changing easy. Edit add delete WordPress user roles and capabilities.

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This plugin to show announce for per user roles.
And, if you want to change plugin capability, please refer to this code.
For example add filter:
<pre><code>function afd_custom_change_capability( $capability ) {
 // plugin minimum capability
 $capability = 'edit_posts';
 return $capability;
}
add_filter( 'afd_capability_manager' , 'afd_custom_change_capability' );
</code></pre>
And, if you want to add filter, please refer to this code.
For example add filter:
<pre><code>function afd_custom_filter( $announces ) {
 // filter
 return $announces;
}

add_filter( 'afd_before_announce' , 'afd_custom_filter' );
</code></pre>
<h3>日本語でのご説明(Japanese description)</h3>
このプラグインは、ダッシュボードにお知らせを表示するプラグインです。 
ユーザーの権限グループ別に、編集者のみへの表示、 
投稿者と寄稿者と購読者のみに表示する設定もできます。

User Roles vs Announce from the Dashboard