Login to QuikStor Express
If you're at your computer when the reservation is made, you'll get a handy popup in the bottom right corner of your screen
From the QuikStor Express home screen
The unit will show as reserved in your main units list, and you can also use the filter to just look at reserved units
Once you're viewing the customer's reservation you can make modifications to the reservation (to change contact information, move-in date, etc.) or move the customer in when they show up to rent!