How do I get EEGlab to recognise channel locations for data imported from Brain Vision Recorder?

I'm relatively new to EEGlab. I have recorded some EEG data using Brain Vision Recorder (with an EasyCap EEG cap). When I import the data using EEGlab, I can see the data and associated channels when I plot the channel data (scroll). However, if I want to plot the channel spectra and maps, I can't because it doesn't seem to recognise the channel locations. What am I doing wrong? Thanks in advance for any help you can provide! Cheers, Martin.