You can open an "envelope" in Privat24 through the "Envelopes" menu or the "Wallet" menu.
You can familiarize yourself with the conditions for accepting Ukrainian citizenship on the official website of the State Migration Service of Ukraine: https://dmsu.gov.ua/poslugi/nabuttya-gromadyanstva-ukrajni/prijnyattya-do-gromadyanstva-ukrajni.html
You need to go to the Monobank application and take the following steps there: click on the "Bank" item to go to the basic settings; click on the "Create" button; enter the name of the goal for which you want to save money, as well as choose the currency; determine the amount you want to collect (but you can skip this point).