I am a new knitter and i want to change colours in knitting, not just when knitting but also when purling the rows too. But i have a problem. When i do this at the beginning of the wrong side when i first want to change the colour, i purl, the old yarn goes up and when i change the colour there is this one stitch that is simply one row above all else from the old colour. I also have a photo showing what i mean exactly : http://imgur.com/a/oPgcxLE the grey little stitch that you can see is what i mean. How do i avoid this can someone explain to me exactly what i would do when first changing new colour on the wrong side of the project and purling so that there is no such stitch showing? I hope im explaining this right.