Timepiece configuration pages can be found at Jira Administration >> Apps >> Timepiece - Time in Status for Jira
The same pages can be accessed though the settings menu (cog icon) on Timepiece page.
(TiS Cloud) Access Settings(TiS Cloud) Calendar Settings(TiS Cloud) Format Settings(TiS Cloud) Addon Settings(TiS Cloud) API Settings(TiS Cloud) Renaming your Jira Cloud Site