Discord is a free group-based communications platform used for voice, video and text messaging by different types of communities.
Discord Nitro is an upgraded version, allowing for extra features like server boosts and profile personalisations, which are obtained via a paid subscription of $9.99 a month or $99.99 a year.
Log into your Discord account (desktop or online)
Head over to user settings by clicking on the cog in the bottom left corner
Select 'Subscriptions' on the left hand panel and navigate to the dedicated Discord Nitro banner.
Click the 'Cancel' button on the banner and confirm when prompted by the pop-up.
Subscriptions can show up in a variety of ways, so make sure you know what the Discord Nitro one might appear as. You can spot it with one of the following titles: