Just go to Administration - Plugins - Install in your Jira, search for 'CB Time Reports', see 'CB Time Reports' and click install.
When installed CB Time Reports add-On adds CB Time Reports dashboard item and project report with the same name.
Report is accessible via menu Projects - some project - Reports tab - Other category. See also Jira Documentation for more information.
Dashboard item can be added to Jira Dashboard, see Jira Documentation for more information.
CB Time Reports underlying data (worklog) can also be exported to Excel on the report page.