It's currently not possible to create mind map presentations using the MindMeister mobile apps, however, you can play presentations you've previously created with the web app.
To play a presentation on your mobile device, simply open a mind map that contains a presentation and tap on the play button in the top-right corner of the map editor.
Use the arrow buttons on the left and right side of the screen to navigate through the slides. Note that in the iOS app, the arrow buttons disappear after the first slide, but you can still navigate by tapping on the screen where the buttons used to be.
Press the X button in the top right to close the presentation.
Tip: It's beneficial to use your device in landscape mode when playing presentations.