Phentex slipper question

Hi
I’m trying to knit some slippers.
I understand when i’m on the right side that i need to drop on color and pick up the other.
What i dont understand is when i’m on the wrong side and knitting, i dont understand the concept of twisting and changing the colors.
Currently i am switching colors between the two needles?
Can someone please help?
Thanks
Christine

http://www.yarns-and.com/fabrics/Phentex/PHEslipperptn.htm

Is this the pattern you are using?

I haven’t made these, but it sounds like someone else had a similar question here…

http://forums.bellaonline.com/showflat.php?Cat=0&Number=22831271&Main=22831092

HI
Yes these are exacky the slippers and i did read the link you sent me before.
I’m not sure i understand the switching color part on the wrong side.
I knit the slipper but it came out sooo small…
I;m not sure what i’m doing wrong