Log in to the Oracle Cloud console and select your ADB instance to view the instance details. In the details, find the section titled ‘Network’ and click on ‘Edit’ next to ‘Access Control List’.
In the ‘Edit Access Control List’ dialog, choose the type of entry that you’d like to make and enter the appropriate value. You can add entries by IP Address (I added my local IP), CIDR Block (maybe your office has a range of IPs assigned to developers), and VCN (by name or OCID). Add as many as necessary.