You can install Optimizer for Jira in two ways; through the Atlassian Marketplace or within Jira using the Universal Plugin Manager (UPM).
For both methods, you will need your Administrator’s permission to install the app to your Jira.
Atlassian Marketplace
Search for Optimizer for Jira and click Try Now.
Within Jira, click Apps in the top navigation and click Find New Apps in the drop down menu.
Search for “Optimizer for Jira” and the app should appear in the search results.

Click Try it free and it will be added to your active apps.