For discord VIP role, please follow the instructions mentioned here:
For those who have a donation rank on the server, and also want their special VIP rank in Discord, take a screenshot of you (remove your nickname first!) saying 'This is for Discord. My discord ID is (e.g henkekalmar#7675)' and post it in technical support, along with the reason for the screenshot. A server administrator or moderator will set your rank shortly.
For the forum rank, just mention your forum name in the message.