How to get to day 2?

First of all, in Fileion, we don't share any paid things for free. So, the game you downloaded, "Your Boyfriend", is only a free demo version of it.

To continue playing day 2 or day 3, you need to join their Patreon which is as low as $1.

You can join their Patreon from here: https://www.patreon.com/Inverted_Mind_INC/membership

Note: I have translated your question to English using Google translate as only English Language is acceptable.