@Olga133 Glad you clarified what you are asking. First, you will need to describe the items you charge for in your listing. For example, "I offer a bottle of wine for an additional cost of $xx".
Since you have Instant Book enabled, the guest's payment method will be charged immediately. You still can message the guest and ask if they want the additional item: "Would you like a bottle of wine for $XX?" If the guest says yes, then you can go to the reservation and make a change (alteration) to increase the price to include the additional service. The guest will have to accept it so it is important that the guest answer your question affirmatively.
I would do this when the guest books, not during their stay. Why? Because once the reservation has started and you have been paid, any additional requests for payment would have to go through the Resolution Center. In these cases a guest can decline to pay and the issue would have to go to Airbnb for mediation which can be a hassle.
Here are some relevant links to help you with this:
https://www.airbnb.com/help/article/50/i-m-a-host--how-do-i-make-a-change-to-a-confirmed-reservation
https://www.airbnb.com/help/article/767/what-is-the-resolution-center
Also, Olga, I noticed that you have 2 listings where the cover photos and titles are identical. I would recommend that you change one of the listing's cover photos and the title so as not to confuse yourself and guests about which listing they booked. One .could even be #1 and the other #2.
I hope this helps!
Clare