Before being able to create your Jinius Shop, you must register as a Jinius Business customer. If you haven’t registered yet, you can find instructions in the following links on how to become a Jinius Business customer:
The second requirement, is to choose a subscription plan that includes the "Marketplace" service. Currently this is offered under the "Enterprise" and "E-commerce" plans.
If you are signing up now, you can choose the subscription as part of the sign-up process.
If you already have a Jinius Business account, log into it and in the top-right menu, select Settings → Subscription, and click on “Change Plan”.
Here you can view if your current Subscription allows you to create a Jinius Shop, and if not, change it accordingly.