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You can subscribe to a monthly Premium membership ($12.99/month), 6-month Premium membership ($71.94/6 months), and annual Premium membership ($107.88/year) which will renew automatically.
You will have full control over your account and you can cancel your subscription anytime from the Settings Page, Account tab (Login - LingQ). When you downgrade your account to Free, your subscription is automatically canceled and your account is moved down to Free at the end of your current billing cycle.
If you are using the LingQ app (both Android or iOS) you can upgrade your account through Google Play or Apple Store too.
Let us know if you have any additional questions!