How to turn off auto-correct for a certain word

You are always logging into a site yet autocorrect keeps changing your username.

To solve this, first go to settings and then general.

Under general, go to keyboard.

Under keyboard, at the bottom click add new shortcut. (unable to get a correctly centered screenshot of this)

Just type into the top blank the word you want to stop being corrected and leave the bottom one blank. Click save.

Now anytime you type this word it will not get corrected.