The only way I know to crochet letters onto an already completed afghan would be to use surface stitching. Another method, which is not crochet but which would give a very nice look, would be to...
You can crochet a chain stitch with your fingers, but doing other stitches will be impossible unless your work is very very loose. It is technically possible to crochet with a knitting needle, but...
Both are crochet but each use a different catalog of stitches. Crochet is what most people associate with. Single, double and treble crochet stitches are examples. Interweave crochet is otherwise...
Choose which one you want to have as the base, the ripple or the straight. The easiest way is to attach to the ripple and work and increase through the low point of the ripple until you have the same...