MetaRiddle is really easy to understand, and hopefully not too dificult to complete.
Although the difficulty increases underway, the way to progress will mainly be the same.
Each level (lvl) in the riddle, will contain hints or means for you to figure out the word or
words, needed to proceed to the next lvl.
The hints can be hidden in several ways, this guide will teach you the most basic.
The command CTRL+A (select all) will e.g. show hidden text that wasn't possible to see before.
Try it now, and continue to the next HowTo when you have found the hidden link