Please help me understand for the side edging pattern:

Side Edgings
With right side facing, join yarn in right-hand edge of Row
1; ch 1, work 64 (68, 75) sc across row ends. Fasten off.
Repeat Edging on left edge.

Do I have to single crochet from going up or side ways from right to left?

I am crocheting a cardigan on the pattern it says for the side seams:

Fold Body in half with right sides together so that piece is
now 10 (11, 12)” high x 32 (36, 40)” wide. Sew side seams
from bottom corners toward fold line through 12 (14, 15)
sc of both thicknesses leaving 40 (40, 45) sc free for each
Sleeve opening.

Please explain it to me if i need to fold the body lengthwise or crosswise?

Your help will be greatly appreciated. Thanks a lot.