You will be able to see your level in the game, on the upper left corner of the screen, next to the Settings icon.
If you are in the course of a game or in another section of the game, you can access the Episodes section by going to Settings and taping on the Home icon. There you will be able to see the Episode you are in and its corresponding levels.
If you tap on your Episode, you will be able to scroll up or down and see the different Episodes in the game, the ones you've already completed and those that are yet to be completed.
If you press on your level, you will be re directed to the game to pick upf where you left off.