I have one on my page I just don't know how to put it on here

don't worry you can just click the collage you made then you press the bottom right hand corner button and it will save to your photos and then press 'view all related remixes' you then press 'add remix' then you add your photo in click it and press Set as background and than you click done 😉🐴🏇🐎

make sense?