Inexistence

Hey guys, I'm new here. I used to play the keyboard but stopped after a while when I found it too difficult. I'm regretting it now as I want to learn to play a certain song on the keyboard but I can't recognise the notes just based on where they are in the music, I need the letters of the notes. If anyone can help me I will send them the sheet music which is in .pdf form. I only need the basic tune, not the undercurrent and everything. Thanks.