A (shape) button has only one Success event, that can trigger an advanced action. If I understand your requirement correctly, it is a bit confusing, you want that button to display first more information, then to click again to go to the next slide. BTW although you can force that information to appear, you never can force a human to read it 
Just with states that will not be possible, since you need two actions, you'll need two interactive objects. This could be a workflow:
- Create two identical (shape) buttons and check the style of the InBuilt States; I will label those buttons SB_One and SB_Two
- Put them in exactly the same location (use Align option)
- Make the second button invisible in output (eye icon on the Properties panel)
- For SB_One, add a custom state 'Info' that shows the wanted information
- For SB_One create this advanced (or shared) action:
- Change state of SB_One to 'Info'
- Disable SB_One
- Delay Next actions by x seconds x needs to be the estimated time needed to read the info
- Hide SB_One
- Show SB_Two
- Enable SB_Two
- For SB_Two the simple action 'Go to Next Slide' is OK.
Beware: this is a case where replacing the custom state by a text container with the info (or a group if you need more than just text) would perhaps be a better choice. That container (or group) should be invisible in output. The action for SB_One would be in that case:
- Show Text (or group)
- Disable SB_One
- Hide SB_One
- Show SB_Two
- Enable SB_Two
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