Tap the photo or video. Type a message, and then tap Done, enter, or tap the screen. The text is automatically added to the center of the screen. Touch the "T" in the top right corner of the screen to enable text effects. This will enlarge the text, center left, and remove the caption bar.  Tap the “T” a second time and it will align the text in the center. Tap a “T” a third time and it will revert you back to the original. Touch and drag the text to move it. Pinch the text to shrink it. Zoom the text to increase its size. Rotate your two fingers together on the text to turn the text to the angle you want. Tap the actual text. The color picker and keyboard will open. Touch the color picker to change the text color. When you're done, touch Done, enter, or tap the screen. If you want to change a single letter or word, select that letter or word, and then touch the color picker to change the color that that letter or word.

How would you rephrase that briefly using Vietnamese?
Thêm chữ vào ảnh hoặc đoạn phim. Bật hiệu ứng chữ bằng cách chạm vào biểu tượng "T" ở phía trên góc phải màn hình. Di chuyển, thay đổi kích thước, xoay chữ. Thay đổi chữ hoặc màu chữ.