I am not clear on your meaning but I can say that I have had no problems in sending and receiving msgs via WikiTree.
If you post a question or reply to 'questions' on G2G with an 'answer' then a list is kept for you of these questions. Click on 'My WikiTree' at the top of the screen and choose option 'G2G Profile'. Scroll down and you will see a list of the questions you have posted or answered.
You can also find questions via the (green) 'tags' that are attached to a question.
If you are asking me about receiving confirmation of a msg you sent privately then I don't know that there is a response.
I am replying to you now via your question 'How do I respond to an answer I receive'. If you look at this question again you will see the original question and all answers and comments (including this one).