Flash sync troubles

Hi everybody, I have a question about my Cannon EOS Rebel Ti. While reading the manual I learned that my camera allows manually setting the flash sync speed but it does not actually say how to set it. Is this a setting that I would find on a seperate flash module or is it a setting for the built in flash that I am missing. Anybody familiar enough with this model to answer this? I would greatly appreciate it!

I found some neat tricks to try with a flash but I can't try most of them without figuring this out first.

New user and relatively new to the photography game. I was not really sure where to ask this so sorry if its in the wrong place.