Sure! You can give the gift of Brilliant here: https://brilliant.org/give-premium/
It's worth noting, however, that gift subscriptions can't be applied to the same account they were purchased from, so make sure you're in your own account when sending a subscription to someone else and not purchasing one for yourself. You can purchase your own subscription here: https://brilliant.org/premium/
Still have questions? Reach us at support@brilliant.org.