You can do some vector graphics in Scribus, but basically it is not made for it. Scribus is a publishing software, comparable to InDesign oder Affinity Publisher or Quark Express. The strength of Scribus is to produce and pre-press books, flyers, posters, magazines, newspapers, etc.
If you want to work with vector graphics and have a Windows machine, you might consider Xara or Inkscape or Gimp, or Illustrator or Affinity Designer.
If you just want to import a graphic into Scribus and have the text flow around it, select the graphic, go to -> Properties -> Shape -> Select any flow scheme next to »Text Flow« you want to use
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