I urgently need help on reading pattern

Hiya, I was wondering if someone would be able to help. I have just started this new knit project and I’m a little confused. In the notes it says use 2 balls of yarn. Do I only use them for the first 2 rows then go back to a single ball of yarn or do I use 2 for the whole piece? Hope that makes sense, thanks!

Welcome to KnittingHelp!
What is the name of your pattern?
Looks like you may be working in stripes? Use ball 1 for 2 rows then ball 2 for 2 rows and continue alternating yarn balls. It’ll help to know the pattern name and designer or source.