To do this, firstly you need to create an empty page and choose it as a Portfolio in Theme Settings -> Portfolio -> Portfolio page. Then add your projects with images and texts in Dashboard -> Projects -> Add New
The tabs you are talking about are actually the Display categories list that allows you to filter your portfolio projects.because you have created 8 categories and all categories are showing in filter style.
This option is disabled in Theme Setting> Portfolio> Portfolio Archive> Show categories filters