As soon as you log into the AKO account, it will go to the soldier's main page. Look all the way to the right and about midway to the bottom of the page. There should be a few links, and one of them will say "View My ERB". Click on that. The next page may ask you to log in again, or it will have another link saying "View My ERB".
However, if your husband is in BCT or AIT right now, this stuff might not be on there yet. That is because his AKO account still lists him as a "recruit" or is not fully "activated" yet. That was what the situation with mine when I was doing my training. I had to wait till I got out and had to contact my recruiter to help me with fully activating my AKO account.
Another thing, the ERB is not going to show where he is going. The ERB just shows things that are on his file as of right now. Like it will only show the units that he has been in so far, and the unit that he is in now. When he gets to his duty station and signs in there and gets done with his paperwork at his battalion level S-1, it will show up on there as the unit that he is presently with. It does not show where he will be going.
There is another thign to look at that MIGHT have it on there. When you log into the AKO and look to the right and midway to the bottom, there should be a link that is called ASK (Assignment Satisfaction Key). Click on that, and then at the top of the page there will be a row of links, one of which being "Assignments". Click on that. It may or may not say on there which unit he is going to. A lot of guys that I was in training with looked on there and it told them where they were going to be going. But others, like me, didn't have it listed on there.
On top of all that, there is no for sure way of telling where he will be getting stationed at until he comes down on his orders. If he is in training righ tnow, the drills will let him know towards the end of the training when the orders come in. If he is overseas right now, then he will get an email telling him that he is going to be assigned somewhere else.
Good luck with it all..