Does your organization allow this?
Not all officiating organizations allow their officials to request games themselves. In fact, most do not allow you to request your own games. Many officiating organizations only allow officials to specify when they are able to work via the official's Availability Calendar preferences. The officiating organization will then schedule you to games at their discretion based on your availability.
The TBA System
If your officiating organization allows you to request your own games, this would be done using the TBA System (to be assigned) which operates like a "help wanted" section in the software. You can read details about the TBA System in this support article.
If your organization is using this functionality AND your scheduler has made at least 1 or more games available, then you will see the TBA Requests link available in the main navigation menu of the software. The TBA Requests navigation menu item only appears in the navigation menu while active TBA Requests exist. If the TBA Requests link is not visible in the navigation menu, then there are no existing TBA Requests available at that time.
TBA Requests are not guaranteed to exist for any length of time. As soon as the issuer either retracts or fills the request, the game will no longer appear. It is common for TBA Requests to only exist for a few minutes, so if you're not quick, you may miss them.