Hello Sigmod,
The bridge IP address should be whatever you set up at the Setting/internet page when you selected Bridge mode if you selected static. If you left it on Dynamic IP address, you will need to connect to the device and using its local DNS name (http://dlinkrouter.local) your should be able to find it on the network and connect you to its GUI.
If you want to find out the IP of the unit when left in DHCP do the following:
1. Connect to the LAN port or even the WAN port (in Bridge Mode this port becomes part of the LAN) the unit defaults to an APIPA address on a network without DHCP server and so would your computer. These addresses are on the 169.254.XXX.XXX IP address space, so if you ping its device name "dlinkrouter" it will return his current IP.
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2. Open your browser and type, http://dlinkrouter.local/ or the IP address that shows up in the ping results to open up its configuration pages.
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3. Choose the Wireless SSID (stronger signal better, 5Ghz preferred) you would like to bridge to and save the settings.
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Enjoy your bridge