Knitting with straight needles is great for many things, but if you want to knit a seamless tube, you're going to need to learn to knit in the round. This video will help you learn to knit in the round on a circular needle.
Make sure not to twist your stitches when joining to knit in the round.
Knitting can be addictive!
Step1
Select yarn and appropriate circular needle for the number of stitches you wish to cast on.
Step2
Cast on the desired number of stitches onto your circular needle. If you don't know how to cast on, see my videos on several different methods of casting on.
Step3
Watch the video to see how to join and start knitting in the round.