Click the "Solution" link on the right of the page (it has a forward arrow "play" icon). It's in a shaded box with the links "Try vs. Computer", "Try Again" and "Analysis Board".
Tactics Trainer

Still can't find it. Can start tactics trainer but can't find the gray setting with try again/analysis board/solution/try Vs. computer. Where is it?
sounds like a browser problem of some sort, do you have a screenshot?
The solution and try again buttons appear after you fail or if you succeed, regardless, its after you make a move. There does not seem to be a "show me, I give up" option, just make your best move then you should get these items. If you do not see them at that point, it sounds like a browser/web page fail.
How do you get the solutions to come up on Tactics Trainer? They used to but don't anymore.