Gold certificate seal?

There are many online tutorials on how to create a gold seal. Google for "gold seal photoshop elements" or similar.

Or as Hatstead suggested you can Google to find a gold seal image to download, as I have done in the following example.

Add the logo as a separate layer. Add a Color Fill adjustment layer above the logo layer and select a gold color. Group the 2 layers.

If you want to preserve the various colors of the logo but in shades of gold, change the Fill Layer's Opacity to Color.

If the result is too lark or tool light you can adjust it with a Levels adjustment.

For the text, simply use the Text Tool with a gold color.

However, it might be more interesting to have the text embossed or recessed. I don't know if PSE12 has this capability built into the Text tool. My PSE2 doesn't so I use this method:

Add a Low Inner Shadow layer style to the text layer.

Click the "f" icon in the text layer to bring up the Style Settings menu, and play around with the settings to get the embossed or recessed look.  Note that your Style Settings might look different than my version.

Here is embossed:

And here is recessed.

Checking/unchecking the Use Global Light box will switch from embossed to recessed as I have done.