@karolinka27 - It seems to me that you use the Phonetic Bulgarian keyboard layout, which historically originates from the beginning of 80s, when nobody really cared about spelling on computers (the computers were badly pirated Apple II, and the layout was made by an anonymous German speaking IT specialist, who felt that В = W, and Й = J, and V as a spare letter should be given Ж ;-)), so you don't have ѝ on your keyboard. You are free to replace it with й at your choice. My advice was meant for the cases when you do have a choice - for example when writing in hand.

The other option is the Bulgarian Standard keyboard layout, but that would be too difficult for you, since it's built around the specific needs of Bulgarian speakers, making typing faster and more ergonomical, but placing the letters on most unexpected places.  Actually my present keyboard is the first that has ѝ and I take pleasure in using it.

Keep up the good work, we are here to help!