I am also stuck on this exact pattern…I worked out that I do it in rows… but I am uneven in my end… even though my stitches are correct. In short my edge isn’t lining up… help
Welcome to the forum!
Does GG’s and Jack’s advice above help with this? If not perhaps he can explain it for you. @OffJumpsJack
"I agree with @GrumpyGramma when she says to start the next row at the beginning of the previous row.
Also the spelling of colour and the patterns phrase of “join in first st of last row, ch1, dc in next 3 sts…” suggest it is Brittish or UK terms (meaning DC is the same as a US single crochet st)"