If you're a tester, you can use Jira to report bugs and track their status. To do this, you'll first need to create a new issue. To do this, click on the "Create Issue" button on the top left of the screen. Then, select the "Bug" issue type from the list.
Once you've done this, you'll be able to fill out all the relevant details for your bug report. Be sure to include as much detail as possible, as this will make it easier for the developers to replicate and fix the issue.
Once you've created the issue, you can track its progress by clicking on the "Bug" icon on the issue's detail page. This will show you a list of all the steps that need to be taken to fix the issue.