
Where do you think the expression 'fool proof' comes from?

One rule should be: there must be no room for wild guesses or misinterpretation.
In this case I would write under the i-button something like: "e.g. /piwik/ or the complete path to piwik"
And: "fill in 1 if you have only one website to measure".
And even then there will be people like me that fill in 0 or 2.
