The battery has two terminals + & -. Some have a smaller terminal attached to each main terminal, some don't!
If your battery only has the two terminals, then connect the energiser + to + (positive) of the battery, and - to - (negative) of the battery.
The solar panel will also have a + and a - connection lead. These also connect to the battery in a similar fashion to the energiser lead, usually with crocodile clips which will go over or under the energiser crocodile clips when attached to the battery.
Putting it very simply, you may note a 'lump' within the solar panel leads. This effectively is a one way switch which will allow the electrical current to flow from the solar panel to the battery, but won't allow the current to flow from the battery in a reverse direction back up to the solar panel.
Hope that explains it simply, but if it will help, I could send you photos of the set-up.