Choose Tools > Type (from the Tools menu at the top of your screen).
Press the T key on your keyboard.
Hover your pointer over the inner or the outer outline of the shape. When the pointer changes to , click to add a new text box.
To begin typing, double-click within the text box to highlight the placeholder text or place the insertion point where you want the first character to appear.
Once you've added text, you can Shift ⇧-drag one of the text box handles to move the text box along the path or Option ⌥-drag to expand the text box and make room for more text. Also, if there’s too much text to display in the shape, a clipping indicator appears. Drag this handle until all the text is showing.
Tip: To additionally transform the text path or to flip text along the path Control ⌃ – click the path and choose an option.
You can change the look of text just like any other text in your document.