[yco]

sometimes embedding word can be tricky but this what it should like a for time stamp..

<iframe width="560" height="315" src="https://www.youtube.com/embed/nzTlp8Z5gc4?start=92" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

if its just for posting a video on a forum with a stamp.. it depends on the forum version.. older the version lower the chance that it can work.. writing where to start for a video on top is the only choice.. for example Xenforo 2 has it.. here its vBulletin 3.. probably new versions have that function..