If your female is carrying eggs (she'll be obviously plump) and decides she likes your male, they will engage in a 'nuptial embrace' where the male raps his body around the female's under the nest and fertilises the eggs as she releases them. The male will then collect any eggs that don't go straight into the nest and places them there. eep in mind that the nest and eggs are unlikely to survive for long in a community setting and the fry will almost certainly get eaten or sucked into the filter as they are very, very small - they are not like livebearer fry which will survive on their own. If you do want to save them, I'd advise setting up a separate tank and moving the fry over when they start swimming around (the stay in the nest a little after they first hatch) and dividing your current tan so that only the male is in with the bubblenest and eggs (assuming the female is interested in the first place).
How do the eggs get into the bubbles.
