Still not certain of what you are seeing. Provide a screen shot if possible, as above. Be sure that the background color chosen in the text editor is not the same as the text color, or text won't be seen (unless selected).
When composing text, the clip appears in the bin (top-left) and on the timeline (or drag it there). Position as needed.
If you plan to compose additional text, don't drag the existing clip from the bin to the timeline and attempt to change the content. That will alter the original.
Instead. right-click on the clip in the bin and <ctrl-C> to COPY. Then right-click on open area of the bin and click PASTE (Clip/s)
Do this as many times as needed. Then drag individual copied clips onto the timeline and change their text. Leave the master clip as it is.
