where do I find the reset button? This seems like a fix I can work with.
It should be on the back or the bottom of the device. See Using the Physical Button near the bottom of this page for some pictures of what to look for. I think on all expresses, you'll probably be looking to the pinhole type.
Before you do a complete device reset, try just doing the Network Connection reset. This removes all previous network connections that are stored in memory and allows you to connect fresh. Also, on your router you must ensure 2.4GHz is using channel 11 or lower. If for some reason your router has set itself to 12, 13 or 14, your Roku will not be able to see and connect to the router.