If we have all the supplies ready to go it's time to cast on.
Here is the pattern for the rim of the hat:
CO 96 stitches on 4.5 mm needles.
Evenly distribute over 4 needles and join.
Row 1: S1, k1, p2, *k2, p2 repeat from * to end of row.
Row 2: *K2, P2 repeat from * to end of row.
repeat this row 6 more times or until you have about 1".
Here is the pattern written out for a more detailed explanation of what to do:
Use the 4.5 mm needles to start and cast on 96 stitches. Spread them out over 4 of the needles so that you have 24 stitches on each needle. Make sure that no stitches are twisted around the needle (all stitches should be pointing the same way). Hold the first needle and the last needle together so that the 4 needles make a square. Using the 5th needle, slip the first stitch onto the new needle without knitting it. Knit the next stitch. Bring the yarn to the front and then purl two stitches. Continue knitting 2 stitches and then purling 2 stitches until you finish the row. The second row starts with 2 knit stitches, so you are knitting the stitch that you slipped at the beginning of the last row. Pull this stitch very tight after you knit it. Follow the knit 2, purl 2 pattern until you have completed 8 rows total.
Here are the videos if they help:
Joining and knitting: