No problem, once you get used to PTE it is very easy.
You need to go into Objects & Animation & you will see the image & you can add your Text there.
Type the Text you want & adjust it's postion & size by Clicking on it & dragging.
Then go to the Animation Tab & look at the Timeline below the image & you will see a little blue square at the start - this is a Keyframe.
Drag this to the end of the grey bar so it is at the end of the Transition In for the Slide.
Set the Opacity at this point to be 0%
Add another keyframe (right Click & select Clone)
Click on this & drag it a bit further along & set the Opacity to 100%
Add 2 more Keyframes further along the Timeline at the point you want the Text to fade out, setting the first to 100% & the 2nd to 0%.
The distance between the Keyframes is the time it takes to perform the animation.
So a longer distance = a longer time.
You may need to adjust the duration of the Slide to fit.
This is the easiest option to try while you are still learning.
Once you are more familiar you can then have a go at Text Animation which is located on the Property Tab in O&A
Just play around until you get the hang of it.
Jill