You can customise the toggles by clicking the pencil icon in the top right. You should then be able to add a wifi toggle icon.
Edit: Ok. It seems like Verizon have removed that toggle. If you're rooted you can add it back though. See link here (contains screenshots).
You need to download and install SQLite Editor - you need to download and install SQLite Editor
Open up SQLite Editor - Select the Apps tab on top and scroll down until you see Settings Storage and click it.
Click on Settings.db
Click on system
Click on the search icon on top right
Type in the word notification in the Filter Value field and click ok
Once the results load up, tap on notification_panel_active_app_list (should be the bottom result) and click on the pencil icon on top to edit
In the Value field, you'll see all your toggles listed. All you have to do is add the word Wifi <-- just like that with a semi colon right after. Make sure there's no space after the semi colon like in the screenshot below. Once you add Wifi, click the save button.
Close SQLite editor and reboot your phone. Once your phone boots back up, you should now have the Wifi toggle in quick settings!
