Premiere Elements 14 on what computer operating system?
Black in the Titler text files is not a color. Black represents transparency in the title file through which you can see what is in the track below.
In the simplest case, place the finished title file on Video 2 and a Color Matte on Video 1 underneath the title file.
For creation of Color Matte, see Premiere Elements 14 Expert workspace - Project Assets - Panel Options - New Item - Color Matte.
Please let us know if that is the information that you sought. If not, please give more details.