Once you have completed the security review, you are able to request through raising support cases via the Partner Portal to have access to the LMA. Once this is provided by Salesforce, use the installation URL to install it like any other package into your LMO.
If you have requested a CRM for ISV's org (through a case raised within the Partner Portal), you may find the LMA already installed.
The following screenshot shows the main tabs of the License Management Application once installed:
In this section, I will use a package that I already own and have already taken through the process to help illustrate the steps that are involved. ...