Am I allowed to turn off the match after I have lit the Shabbos candles and before making the Bracha?
The custom is not to put out the match after lighting Shabbos candles, rather you should put it down and let it go out by itself.
Based on Alter Rebbe’s Shulchan Aruch 263, 7.
Some suggest that the custom is that women accept Shabbos when they light and make the Brocho on the candles, so therefore they shouldn’t put out the match.
For an analysis of this custom, see here: