Simple Custom Reports & Charts app adds menu items in two places on your Jira instance (if no menus are visible after installation, you might need to refresh the page).
Project sidebar menu (highlighted in blue) - the app starts with reports on issues in the current project.
User account menu (highlighted in green) - the app starts with reports on issues assigned to the current user.
Simple Custom Reports & Charts app adds a link to the main menu of Jira, the app starts with reports on issues in the current project.
In addition to preconfigured reports (Project, User, Epics), the app also allows you to add custom 5 dashboard gadgets as native Jira dashboard gadgets.