Domain Lock is a prevention tool to stop un requested attempts to transfer your domain. This feature should be enabled at all times unless you are transferring the domain.
Domain lock can be enabled / disabled within your account are found at https://core.evolvewebhost.com
To begin, login to your account and navigate to Domains > My Domains
Once your list of domains appear:
Manage 1 Domain at a Time
Click on the down arrow to the right and choose 'Manage Domain'. Find the link toward the left of your screen that says 'Registrar Lock'. The following screen will provide you with the option to enable this feature if it is not already. If it is already enabled, no further action is required.
Bulk Manage Domains
Check the boxes to the left of your domains, click the down arrow near the bottom of the page and click 'Registrar Lock Status'. On the following screen, click 'Enable Domain Lock'.