If you are purchasing for the first time
Go to MysteriumVPN website —> Pricing Page and select Get Monthly Pro Plan:
2. On the left, enter the email address for your account and in the Order Summary section, make sure to insert your COUPON code, then click Apply:
3. Lastly, select Your one-click payment option or manually fill in the card details to complete the registration:
And that's it! Once the registration and payment goes through, your account will be activated!