Acer i cant change my profile picture in badoo pleas help

For example I have 15 pictures to choose for profile picture in my album,and when I delete that picture who was on my profile pic badoo automatic takes next picture who was next to deleted picture,so I put picture which I want next my profile picture and when I deleted pic. I got my favorite picture for profile,and after that I was add again that picture which I was deleted and she is in album again :D (with mouse you can sort picture how you want),so with mouse you can put favorite picture in front of existing profile picture and when you delete that existing picture you favorite automatical set for profile picture