To find the camshaft timing marks, remove the valve cover. The marks will be visible on the rear of the camshafts. The intake camshaft mark is a small dot, while the exhaust camshaft mark is a small line.
To align the camshaft timing marks, rotate the engine until the marks are aligned with the corresponding marks on the cylinder head. The engine is at TDC of the compression stroke when the marks are aligned.
Once the camshaft timing marks are aligned, you can install the valve cover and timing belt.