Hmmm, that is a good question. I know I personally used the import feature myself a couple months ago, but I just went back to locate the option for you and I don't see it either at the moment.
I know there has been an update on this mod since I used the import feature and maybe somehow the import link accidentally has been covered up. You can either wait for DBTech to respond (which I'm sure will happen shortly) or you could try the earlier version. I'm pretty sure I imported from vbSEO myself with version 3.17 of this mod.