The import service is a built-in feature of the Nembol Web subscription. Once you've created an account (go to app.nembol.com and sign up), access the channels area and connect the integrations you'd like to use. An "import" button will automatically appear after you log in.
When you click "Import", all active/unhidden items are brought over to Nembol from the channel of your choice. You may click "Import" several times at no risk: Nembol does not duplicate items that have been already imported.
During the trial period
Nembol Web is available as monthly subscription service with a 14-day free trial period. During this time, the built-in import service is limited to 5 items. If you'd like to import all of your products right away and not to wait the end of the trial period, simply add a credit card to your account and upgrade to the paid version to unlock the feature.
With an active subscription
Once you'll have an active Nembol Web subscription (if you upgrade or at the end of the free trial period), you'll be able to import all of your products from the channels that support the service. Once imported, find your items in the "Products" area, ready to be shared on more websites simultaneously.