If you want to display only one album, you could enter the text:
%%wppa%%
%%cover=3%%
%%size=450%%
That will give the following result:
Alternatively you might want to display the contents rather than the cover of the specific album.
Try this:
%%wppa%%
%%album=4%%
%%size=450%%
That will give the following result:
Note that you can display any album this way. It may be a top-level parent album, a (grand)child album or even an album that does not show up in your generic photo album display.

