Fast forwarding from within spotify premium?

Hi everyone: writing here with a question. Using spotify premium on an iphone 5 latest ios. I can't figure out when on a playlist How can I move forward to the next song? please help, lol have been playing with this all day and can't figure it out I used to be able to accomplish this a while ago but I am not sure if this portion of spotify remained accessible or not from the iphone. thanks.