There are several methods to connect these units to your Wi-Fi network. The simplest method would be via the Manual setup via the unit’s menu system. Here you can select your network SSID and enter the password to connect the unit via Wi-Fi.
For further information and alternate methods, please refer to page 28-29 Section 3.7 of the user manual: https://anthemav.com/downloads/avm-mrx-english-manual.pdf