To change your address, you must click on "My account".
Here you must first delete your old address, you can do this under "My address" by clicking on "remove an address".
Unfortunately, to add an address you currently have to register for any auction for live bidding. In the course of this registration you will be asked to enter an address.
Of course, registering for live bidding does not force you to participate in the auction.
Please make sure that you do not place a bid by mistake. The registration as such can simply be ignored afterwards if you have not placed any bids and do not wish to bid.
We are already working on a way to add the address directly to the user profile.