Question about Zyxel WRE2205 v2, n300

You can proceed according to the Quick Start Guide, numbering according to the information there:
Point 1) Switch on the WRE2205 and plug it in. Wait until a WLAN signal is found.
Point 3.1) Write down the last 4 characters of the MAC address (on top of the WRE2205), e.g. 4124.
Point 3.2) Search for and connect to the ZyXEL wireless network (password: 00000000).
Point 3.3) Open http://zyxelsetup4124 in your browser (using the four characters from point 3.1). Use admin as the user name and 1234 as the password.
Point 3.4) Go through the settings step by step in the browser, selecting the previous Swisscom WLAN with the previous WLAN password.