How do I use this Colemak keyboard?
Type on your normal keyboard, and each key types the letter it has on the Colemak layout. For example, pressing the QWERTY keys j, k, l types n, e, i. You can also click the keys on the on-screen keyboard, which shows the Colemak letter on each key with the QWERTY key underneath.
How do I type capitals and symbols?
Hold Shift as usual. Shift gives the capital or symbol of the Colemak key, so it works the same as on a real Colemak keyboard.
Can I use it to practise Colemak?
Yes. Keep your eyes on the on-screen keyboard rather than your own keys, and the key you press lights up. When you've finished, copy your text with the Copy button.