I have just purchased highcharts, but the credits link still appears on my graphs which are quite prominent on my site and it distorts the chart view.
I assumed I would get an option, so how do I remove it?
You can customise the credits, changing the URL, text, Position etc. All the info is documented here: http://api.highcharts.com/highcharts/credits. To simply disable them altogether, use:
credits: {
enabled: false
},