Finding Clockwork
Clockwork Panel on the Work Item
Once Clockwork is installed, you should see a new section on the Jira work item allowing users to log work and view past work logs:

If you do not see the Clockwork panel, click on the gear icon in the top left of the work item and select Clockwork.

Check Permissions
Clockwork requires users to have at least one of these permissions in order to view the Clockwork panel on a work item:
Work on Issues/Log work on any issue
Clockwork View All Worklogs
These are project level permissions that are configured differently for Company-managed projects vs Team-managed projects:
Company-managed Projects:
To verify that a users has Work On Issues permission, go to Project settings > Permissions and check that the user is a member of a role that has Work On Issues permission.

To verify that a users has the Clockwork View All Worklogs permission, go to Project settings > Permissions and check that the user is a member of a role that has Clockwork View All Worklogs permission.

Team-Managed Projects:
To verify that a users has the Log work on any issue permission, go to Project settings > Access > Manage roles. Select the appropriate role and then select the Project permissions tab to ensure that the Log work on any issue box is checked.

Clockwork View All Worklogs
To verify that a users has the Clockwork View All Worklogs permission, go to Project settings > Access > Manage roles. Select the appropriate role and then select the Apps permissions tab and find Perform "Clockwork Automated Timesheets Pro" actions. Ensure that the Clockwork View All Worklogs box is checked.

Viewing Timesheets and Reports
To view a timesheet, click on the arrow next Apps in the left nav bar.
Click on the arrow next to Clockwork and select the appropriate Clockwork page.

License Requirements
If you are unable to view Clockwork on a work item and Clockwork is not available under the main Apps menu, then it may mean that you do not have a valid license.
To check your license:
Log in as a Jira Administrator and go to Jira Settings > Apps > Manage Apps.
Click on Clockwork and check that the License status is Valid.
