To approve a Job you want to start in the 'Jobs' section and click on the one you want to approve.
On the right-hand side of the screen your Job should be in the 'Awaiting Approval' stage .
If it's still in 'Installation Scheduled' this means your Installation Manager hasn't selected to send it for your approval. You can still move it into the next stage, if you need to, by clicking on 'Submit for Approval'.
When your Job is in the 'Awaiting Approval' stage you can click on 'Approve Job As Complete' to approve the Job.
If you need to create another job for that same venue, you can do this at any time by installing or replacing a Spot within that venue. For information on how to do that, see this article.