Thanks everyone for your suggestions, however I've been able to follow @borate and @Nationalsolo suggestions. but the problem am having now is that i can't drag it to surround the letter i want, the dragging doesn't reflect in the sequence preview window. I only have two preview windows, one is for the text i added and the second one is for the video where i want to apply the text, but I can drag text on the first window but i can't see the 2nd preview window whenever am dragging the text on the first window.
How do i get 2nd window to be visible when am dragging text on the first window, or how does it work?