Discount codes and trials
Discount codes: if you have one, enter it at the payment step when buying or renewing a plan and the amount updates before you pay. Every code carries its own terms — validity window and eligible plans — checked when applied; if a code is refused, the message right there says why.
Trials: the Basic plan includes a 7-day trial so you can try the full feature set before paying — each account can start one trial, ever. The trial's end date is shown in your account; to keep the same features afterwards, purchase the plan.
For current offers and terms, see the pricing page and your account's billing section. Anything unclear? Ask via the contact form.