Changing Spacing After Paragraphs: Multimarkdown to HTML

My apologies if this is obvious someplace, but I have read a lot of material (and made some progress) on working with Multimarkdown.

When I select “Multimarkdown to HTML” in the “Compile For:” dialog box at the bottom of the Compile window and then run the compile, the resulting HTML file includes some extra white space after every paragraph. Is there are way to specify that there should not be extra space included after each paragraph? Also, is there a way to specify that each paragraph should include an initial indent or, alternatively, a syntax for a tab indent?

Again, my apologies if this has been asked and answered before.