If there's nothing in your Quarantine folder then it may have been a false detection, since cleared, or something that wasn't very recent. That report is only a general summary and covers more or less the lifetime of the product.
The Quarantine folders are under Navigation - Quarantined and Trusted Items.
Thanks so much for your reply, I deleted everything in the Quarantine folder but after that I scan again and it has the same Trojan: 1 indication... I guess maybe like it has been detected by the software but not actually got into my computer? What do you think about this?
All it means is that it detected something at some stage in the past, not that something is currently in the detection folders.
I wouldn't worry too much but you could run some 3rd Party Tools as mentioned about halfway down this page: https://community.mcafee.com/docs/DOC-2168
That way you would be sure.