This forum post should help with that.
In addition (or when the forum doesn’t help) a google search for “fritzing part l298n” will often find something either in another repository, someone’s github repo or a fritzing project.
I assume you are using parts editor for question 2 (I normally don’t use it) so perhaps one of our folks that do use it will have an answer. I’ve never been able to get it to work well for me and thus tend to edit the underlying xml files (which not everyone here argrees with 
).
Peter