American Dividends

Can someone walk me through the process of what I need to do for taxes when I've received dividends on American stock.

I know they withhold taxes on the payout but I don't know how much. I am assuming that I will get some sort of statement from my investment company.

Looks like for the tax return you need to state the full dividend and how much tax was taken. Currently I don't have this info.

Just trying to get ready for tax return time. I have received a T5008 but that is just purchase/sales of stock.