Trying to make bathing suit straps, but don't understand

I am trying to make these straps for a bathing suit on dpn.

It says, Using 2 double pointed needles cast on 5 sts.

1st Round: Knit. DO NOT TURN WORK.
Slide sts to other end of needle and knit, pulling yarn firmly across back of work.

This is probably simple and I just don’t get it. Please tell me how to use double pointed needles and what to do.

It sounds like you have to do i-cord.

Click on the link below and scroll down to where it says “How to make I-cord” where you can watch a video. (It’s towards the bottom.)

I-cord is easy to do.

Thank you! I was certainly overthinking it. This is a lot easier than I was trying to make it.