how do i activate the credit i got from the sign up link?
You can view the promo code credit balance from the 'Account' section in Cloud Manager.
Promotions: If there is an active promo/coupon applied to the account, it will be displayed here along with the remaining balance and any expiration date. If there are no active promotions, this section is hidden.
As mentioned in the guide, if you don't see the promotion section active, you can manually add a promo code to your account.
If you don't remember the promo code, you can open a support ticket, and we'll be able to add a promo code to your account.