You need to access your account on our website and go to "Manage Subscription" or you can manage your subscription by clicking on the "Manage Subscription" on the email that we sent you when you placed your subscription order. From there, you will be able to add your products, change the delivery date, the order frequency, your billing info or even cancel your subscription. 

Alternatively, you can also go to your Swiss Toniq account by logging in using your username and password Click here, then click on “Manage Subscription » Click here 

Once you are on the Manage Subscription page, click on the "See more details", 
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Then you can add products by clicking the "add product" button;
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Or you can select products shown at the bottom of the screen and click on "add product"
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If you want to add product for one-time purchase only, click on the One-time purchase button and select the products that you'd like to add: 
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The product that you added to your subscription will have the same frequency as your current subscription. If you want to change the frequency of the subscription of your newly added product, you can split the contract and edit the order frequency of each subscription. 

If you want to change the delivery schedule of your next order, please see this FAQ: How do I change the delivery schedule of my subscription items?

Should you have further questions, please do not hesitate to reach out. Thank you