Explore and modify AWS Security Groups rules
To review current security groups from the main menu, select Security Management.
On the new page is a list of all security groups created under the selected account, in the selected region. To review or modify security group rules from the context menu, click Explore Rules.
Delete Rule – To delete rule from the security group, click Delete in the last column
Add Rule – To add new rule to security group, select protocol ports and source IP (IP has to be in CIDR format xxx.xxx.xxx.xxx/xx) and click Add Rule