How can I have a picture in the thread title like ebay?

[Cloud Nine]

like the title says. For instance, if im selling someting on my forum I would like to have a picture of the item in the forums/thread title like ebay has

[kafi]

I am not sure I understand what you mean, but here is one add-on that adds attached image thumbnail on forum display.
Here is 3.5. and there is link for 3.6. I guest too:
https://vborg.vbsupport.ru/showthread.php?t=98651&highlight=thumbnail+forumdisplay