sellvia dashboard

I can't seem to finish of activating Sellvia payments. I've included a ss to show you what I mean.

I'm just starting out so I have many questions about Sellvia. I don't really want to bother Sellvia customer service team with such questions so I came here to get answers. How do you think I should add products to my Sellvia store - one by one or just buy a whole pack? Share your opinion please