What should I know about the flashcards?
A simple tap on the card turns it around; wiping with your finger from left to right or vice versa, lets you move forward or backward through the stack.
The cards may be shuffled by a slight shake of the device.
Tap on the exclamation marks on the back to indicate the level of your knowledge for the word in question. Three brown exclamation marks mean that the level is still low, three grey ones tell Glossa that you know the word very well.
In order not to create a filter for every step in the learning process you may narrow the stack of cards down to a certain level of knowledge: tap the off-white circle in the right corner of the card, and from the menu that appears, select the desired level of knowledge.
Tapping cross closes the cards-view, the question mark opens a legend.