You can use two methods:
Set Webhook URL for the alert to http://profitrobots.com/webhook/00000:000
Where 00000:000 is your key
Install our Chrome Extension and put the key in the extension options. Open TradingView in the Chrome Browser set up alerts as usual and keep the page in the browser open. Chrome extension will intercept popup windows on the page and redirect message from these alerts into the Telegram/Discord.
The whole process is shown in this Youtube video.
The current free limit is 40 000 messages per month.