When you press the symbol key, you have to press again to go back to normal typing - but there's a faster way.

Press down on the symbol key, then keep hold and slide up to the one you want. Release and then you can carry on typing.

This is much faster if you just need to quickly add one symbol.

Another way to type just one symbol is to keep the symbol key held down.

Hold the symbol key with one hand and hit the character with the other. It'll snap back to letters after.