# Modify Rules

It's a good practice to regularly review your NSG rules and modify the existing rules to reflect changes in security protocols or policies or define new rules to address emerging security threats or changing business requirements.

To define rules, follow these steps:

1\. In the **DCD**, go to **Menu** > **Security** > **Network Security Groups**.

2\. Select a data center from the drop-down list.

3\. Select an NSG in one of the following ways to modify it:

* select the **NAME** of the respective NSG.
* select **View & Edit**.

![Select NSG to update rules associated with it](https://1737632334-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MifAzdGvKLDTtvJP8sm%2Fuploads%2Fgit-blob-dfcc5eae5bab0643e87dc6883dbd521b1749c83c%2Fcreate-rule-select-nsg.png?alt=media)

4\. In the **View & Edit Group** window, select the rule in one of the following ways to modify it:

* select the **NAME** of the respective rule.
* select **View & Edit**.

![Select a rule](https://1737632334-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MifAzdGvKLDTtvJP8sm%2Fuploads%2Fgit-blob-5f86052d3d491fa018cfae21e0eb5c41a64309a2%2Fmodify-rules.png?alt=media)

5\. Update the necessary details. You can only edit those values that are enabled for modification.

6\. Select **Edit**.

![Modify the rule](https://1737632334-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MifAzdGvKLDTtvJP8sm%2Fuploads%2Fgit-blob-d3f05f3e435a01fd3d6ed4e046649b3ed3c5955e%2Fmodify-rules1.png?alt=media)

{% hint style="success" %}
**Result:** The selected rule is updated.
{% endhint %}