sigh
'Oh dear. For a sub-editor that's really not good enough. The word you are looking for is 'nicely'. It's a member of the rapidly-disappearing family of adverbs. The majority of them end in -ly, and they describe or modify verbs, advectives and (not many people know this) other adverbs.
Grammar Police'
Oh dear indeed. Rules, knowing when to break them, etc. I believe 'play nice' is a commonly-used phrase, Mr Police, a bit like 'do the math', although of course that infuriates some pedants. Next time I'll use inverted commas if it please you*. Although, actually, come to think of it, my job isn't to please you... at least, not yet. Anyway, rest assured this grandmother knows only too well how to suck eggs.
Now, don't make me break into a stream of advective.
*Don't even start on that one.