This is a rather simple task that allows the integration of a Discord Webhook into your pipeline.
Reading the Discord documentation, will go a long way to help utilizing this task and understanding how it works.
When creating a webhook for a channel in a Discord server, you will be given a url which contains the Channel ID and the Secret Key for that webhook in this format: https://discordapp.com/api/webhooks/{channelId}/{webhookKey}. You will not need to provide the url to the task, but rather just the Channel ID and Secret Key. (The first section in the link above, Making a Webhook, is all that needs to be followed to be able to use this task)
Please read the Discord webhook message API to better understand the fields provided in this task; especially the embeds section if you want more control over your message. By selecting the Message Type of Embeds in the task, you have total control over the message content based on what the API expects to be provided in JSON content.