Hi Ricardo, try this: Create a new circle. Use Layer > Convert to Text Path. Type the upper text, "Photographers". Then press Return and type the lower text "rbfigueira.com". The text after the Return should go on the bottom of the circle, in the opposite direction, which I think is what you want. Use Centre Align on both lines of text. Finally, adjust the baseline of the bottom text using the control in the context toolbar.
You can get to there from where you are, by dragging the path text handles - the little orange triangles on the left of your screenshot - to the semi-circle positions and then inserting a Return between the two bits of text. When you drag the handles, they should snap to useful positions.
Hi Ricardo,
Welcome to Affinity Forums :)
Now put the cursor anywhere in the bottom text and change the Baseline on the context toolbar (the toolbar right above the work area) to put it outside the circle.