I want to repeat a text on a video quickly

About the only way to do something like that would be to use one of the Text Animations. But those animations are pretty much as is. You can't modify them. Still, you should check them out. There are a couple that will add your text one letter at a time.

But manually creating this effect is really a bit beyond the scope of Premiere Elements. (After Effects could do it.) You might be able to pull it off -- but not without many tracks of video and lots of keyframed animation.

If you create the text and position it in the Title Adjustments panel, the text will appear at the same size and in the same place every time you use that title on your timeline.

After that it's just a matter of dragging the title from Project Media to your timeline whenever you want the title to appear.