Ok. There's a tip you can take.
The average keyboard has around 80 keys, not counting the numpad. One of them is backspace and has a long arrow pointing left. Another one says del or delete. Both of them allow you to erase keys, which you can use when you write a typo, especially on a forum post. There is no need to flip out if you mistype something when you can go back to correct it before you press 'post'.