Lock your resources to protect your infrastructure

In the Settings blade for the resource, resource group, or subscription that you wish to lock, select Locks.
To add a lock, select Add. If you want to create a lock at a parent level, select the parent. The currently selected resource inherits the lock from the parent. For example, you could lock the resource group to apply a lock to all its resources.
Give the lock a name and lock level. Optionally, you can add notes that describe the lock.
To delete the lock, select the Delete button.