Finding a buyer i met elsewhere on platform

hello i met a buyer in a social media grp and they are creating their bisqacct how do we find each other so we can safely transact on agreed upon price…we are both very new to this thanx

You can choose in the drop down menu currency you are going to trade on the main screen.
One of you needs to create an offer and the other needs to take it.

You can see the onion address of the maker of an offer on the right for every offer by hovering your mouse over the avatar.