Only one place.
From File > Render to Disk.
Here's what you'll see:

Output size in pixels refers to how big it will be on a monitor screen.
Print resolution is how dense (dot placement) the ink/spread quality will be per inch.
Output Size in inches refers to how big the actual Print will be.
If you want a high quality render I suggest always using Render to Disk... Always.
Absolute Minimum settings I use are 1200 pixels wide (height will auto adjust)
Resolution = 96 d.p.i (300 for print quality)
Output (print) size – depends on how big I want my garbage to be when printed ; )