Hi. Congrats on the new device. Typically you would check under settings, wireless/wifi and there should be an on off toggle. And an option to scan for networks. I'm not familiar with your particular device nor does it seem easy to obtain a user manual via google. However, I would assume it would come with a user guide, so I'd start there by looking for the wifi or wireless settings section.
it should have a screen that pops up & walks u through everything. b4 u set everything up on it i recommend that u play w it a few days we bought 2 7" & after playing on them a few days we really dont like them! u cant download any google apps, most apps on the app store u cant download, u really cant download any of the kid friendly apps. the sound on it is kind low unless u have earbuds in really the only thing the proscan tablet is good 4 is surfing the web