Will this slide show be show in DVD or BluRay? That will make a difference in the size of the photos you use in your slideshow. I highly recommend you do not load photos larger than 2000x1500 pixels in size into a Premiere Elements projects. It will bog down or even crash the program.
There are a couple of ways to show multiple photos on one slide.
The easy way is to create your composition in Photoshop and then output it as a single photo/slide for Premiere Elements.
The harder way is to have each photo on a separate video track in Premiere Elements, and then size and position them so that all are visible. This is a bit more advanced so, if you're just starting with Premiere Elements, I'd recommend you use the first method.
And dont' forget to check out my free 8 part Basic Training tutorial series to help you get started!
Welcome to the forum.
Others have given you some direction on doing what is referred to as PiP (Picture in Picture), but one thing caught my eye:
I downloaded premiere elements 11 yesterday to create a memorial video for one of my family members.
When using the trial version of PrE, you WILL get a watermark in the Exported/Shared/Published output - please be aware of that.
If, after using the trial, you do decide to purchase the program, see this FAQ Entry: http://forums.adobe.com/thread/433730?tstart=30
Note: any output WILL have the watermark, and that cannot be removed from the output file. However, with the directions in that FAQ Entry, one can remove the watermark from a Project, which will need to be output again, so as to not have that watermark.
Good luck, and sorry for the loss - memorial Projects can be rewarding, and are great tributes, but can be a bit tough to work on.
If you do not have Photoshop Elements or Photoshop to make a collage single photo for use in Premiere Elements for your project, please consider the Premiere Elements features that are really not all that hard to work with.
Please work in the Expert workspace and its Timeline tracks it will be easier to see what is going on and thus have more control.
Keep in mind that whatever is on the upper track will be what is seen on the screen unless there are areas of transparency in it
so that what is directly below it can be seen.
Typically your imported image will fill the space provided in the Edit Mode Monitor. If you have a picture of your loved one on Video 2, your text (which has transparency around the letters) on Video 3, and a background on Video 1....then you could scale down/position if necessary the picture on Video 2 so that what is below it is seen. Please refer to screenshot...
You can place another photo on Video 4, scale it down and position it. Then create text for it on Video 5. The following screenshot represents the general idea for two photos with individual text
A shortcut to all those without having to go to a Photoshop Elements collage, would be found in the use of PiPs (Picture in Picture) effects found under fx Effects/Presets. The example of that would be the green background used here, the first photo on Video 2, and then application of one of the stationary or moving PiPs.
Also consider the fX effects that might enhance each of your pictures, such as, Presets/Bevel and Drop Shadow. And, Advanced Adjustments/Vignetting may be of use to you among others.
Please check out the Premiere Elements 11 Effects Reference for a description of all the effects possibilities.
Please do not hesitate to ask if you need clarification on anything that I have written.